77996953668 has 12 divisors (see below), whose sum is σ = 181992891920. Its totient is φ = 25998984552.

The previous prime is 77996953589. The next prime is 77996953673. The reversal of 77996953668 is 86635969977.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 77996953668.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3249873058 + ... + 3249873081.

Almost surely, 2^77996953668 is an apocalyptic number.

It is an amenable number.

77996953668 is an abundant number, since it is smaller than the sum of its proper divisors (103995938252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77996953668 is a wasteful number, since it uses less digits than its factorization.

77996953668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499746146 (or 6499746144 counting only the distinct ones).

The product of its digits is 925888320, while the sum is 75.

The spelling of 77996953668 in words is "seventy-seven billion, nine hundred ninety-six million, nine hundred fifty-three thousand, six hundred sixty-eight".