77899690813 has 32 divisors (see below), whose sum is σ = 96746589440. Its totient is φ = 61227601920.

The previous prime is 77899690789. The next prime is 77899690853. The reversal of 77899690813 is 31809699877.

It is a cyclic number.

It is not a de Polignac number, because 77899690813 - 2⁹ = 77899690301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77899690853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908743 + ... + 990763.

It is an arithmetic number, because the mean of its divisors is an integer number (3023330920).

Almost surely, 2^77899690813 is an apocalyptic number.

It is an amenable number.

77899690813 is a deficient number, since it is larger than the sum of its proper divisors (18846898627).

77899690813 is a wasteful number, since it uses less digits than its factorization.

77899690813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82277.

The product of its (nonzero) digits is 41150592, while the sum is 67.

The spelling of 77899690813 in words is "seventy-seven billion, eight hundred ninety-nine million, six hundred ninety thousand, eight hundred thirteen".