79904040476837 has 4 divisors (see below), whose sum is σ = 79915118265900. Its totient is φ = 79892962687776.

The previous prime is 79904040476797. The next prime is 79904040476873. The reversal of 79904040476837 is 73867404040997.

It is a Cunningham number, because it is equal to 8938906²+1.

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 66192120309316 + 13711920167521 = 8135854^2 + 3702961^2 .

It is a cyclic number.

It is not a de Polignac number, because 79904040476837 - 2¹⁸ = 79904040214693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79904040476437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5538883712 + ... + 5538898137.

It is an arithmetic number, because the mean of its divisors is an integer number (19978779566475).

Almost surely, 2^{79904040476837} is an apocalyptic number.

It is an amenable number.

79904040476837 is a deficient number, since it is larger than the sum of its proper divisors (11077789063).

79904040476837 is a wasteful number, since it uses less digits than its factorization.

79904040476837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11077789062.

The product of its (nonzero) digits is 256048128, while the sum is 68.

The spelling of 79904040476837 in words is "seventy-nine trillion, nine hundred four billion, forty million, four hundred seventy-six thousand, eight hundred thirty-seven".