79256694857 has 4 divisors (see below), whose sum is σ = 83918853396. Its totient is φ = 74594536320.

The previous prime is 79256694809. The next prime is 79256694859. The reversal of 79256694857 is 75849665297.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74588525881 + 4668168976 = 273109^2 + 68324^2 .

It is a cyclic number.

It is not a de Polignac number, because 79256694857 - 2⁶ = 79256694793 is a prime.

It is a super-2 number, since 2×79256694857² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79256694859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2331079244 + ... + 2331079277.

It is an arithmetic number, because the mean of its divisors is an integer number (20979713349).

Almost surely, 2^79256694857 is an apocalyptic number.

It is an amenable number.

79256694857 is a deficient number, since it is larger than the sum of its proper divisors (4662158539).

79256694857 is a wasteful number, since it uses less digits than its factorization.

79256694857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662158538.

The product of its digits is 228614400, while the sum is 68.

The spelling of 79256694857 in words is "seventy-nine billion, two hundred fifty-six million, six hundred ninety-four thousand, eight hundred fifty-seven".