165740994769 has 27 divisors (see below), whose sum is σ = 203548728411. Its totient is φ = 134542704240.

The previous prime is 165740994703. The next prime is 165740994779. The reversal of 165740994769 is 967499047561.

The square root of 165740994769 is 407113.

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

It can be written as a sum of positive squares in only one way, i.e., 158035666369 + 7705328400 = 397537^2 + 87780^2 .

It is not a de Polignac number, because 165740994769 - 2⁹ = 165740994257 is a prime.

It is a super-4 number, since 4×165740994769⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (165740994779) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 54144499 + ... + 54147559.

It is an arithmetic number, because the mean of its divisors is an integer number (7538841793).

Almost surely, 2^165740994769 is an apocalyptic number.

165740994769 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

165740994769 is the 407113-rd square number.

165740994769 is the 203557-th centered octagonal number.

It is an amenable number.

165740994769 is a deficient number, since it is larger than the sum of its proper divisors (37807733642).

165740994769 is an frugal number, since it uses more digits than its factorization.

165740994769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174 (or 3087 counting only the distinct ones).

The product of its (nonzero) digits is 102876480, while the sum is 67.

The spelling of 165740994769 in words is "one hundred sixty-five billion, seven hundred forty million, nine hundred ninety-four thousand, seven hundred sixty-nine".