79839425254681 has 3 divisors (see below), whose sum is σ = 79839434189973. Its totient is φ = 79839416319390.

The previous prime is 79839425254639. The next prime is 79839425254783. The reversal of 79839425254681 is 18645252493897.

The square root of 79839425254681 is 8935291.

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 is a de Polignac number, because none of the positive numbers 2^k-79839425254681 is a prime.

It is a super-2 number, since 2×79839425254681² (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 (79839425254481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4467646 + ... + 13402936.

It is an arithmetic number, because the mean of its divisors is an integer number (26613144729991).

Almost surely, 2^{79839425254681} is an apocalyptic number.

79839425254681 is the 8935291-st square number.

79839425254681 is the 4467646-th centered octagonal number.

It is an amenable number.

79839425254681 is a deficient number, since it is larger than the sum of its proper divisors (8935292).

79839425254681 is an frugal number, since it uses more digits than its factorization.

79839425254681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17870582 (or 8935291 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 73.

The spelling of 79839425254681 in words is "seventy-nine trillion, eight hundred thirty-nine billion, four hundred twenty-five million, two hundred fifty-four thousand, six hundred eighty-one".