117385891863529 has 3 divisors (see below), whose sum is σ = 117385902698007. Its totient is φ = 117385881029052.

The previous prime is 117385891863517. The next prime is 117385891863553. The reversal of 117385891863529 is 925368198583711.

The square root of 117385891863529 is 10834477.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 88417255272025 + 28968636591504 = 9403045^2 + 5382252^2 .

It is not a de Polignac number, because 117385891863529 - 2⁵ = 117385891863497 is a prime.

It is a super-2 number, since 2×117385891863529² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117385891863329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5417239 + ... + 16251715.

It is an arithmetic number, because the mean of its divisors is an integer number (39128634232669).

Almost surely, 2^{117385891863529} is an apocalyptic number.

117385891863529 is the 10834477-th square number.

117385891863529 is the 5417239-th centered octagonal number.

It is an amenable number.

117385891863529 is a deficient number, since it is larger than the sum of its proper divisors (10834478).

117385891863529 is an frugal number, since it uses more digits than its factorization.

117385891863529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21668954 (or 10834477 counting only the distinct ones).

The product of its digits is 783820800, while the sum is 76.

The spelling of 117385891863529 in words is "one hundred seventeen trillion, three hundred eighty-five billion, eight hundred ninety-one million, eight hundred sixty-three thousand, five hundred twenty-nine".