77665656792 has 32 divisors (see below), whose sum is σ = 198899855280. Its totient is φ = 25257123840.

The previous prime is 77665656791. The next prime is 77665656797. The reversal of 77665656792 is 29765656677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77665656791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39463273 + ... + 39465240.

Almost surely, 2^77665656792 is an apocalyptic number.

It is an amenable number.

77665656792 is an abundant number, since it is smaller than the sum of its proper divisors (121234198488).

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

77665656792 is a wasteful number, since it uses less digits than its factorization.

77665656792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78928563 (or 78928559 counting only the distinct ones).

The product of its digits is 200037600, while the sum is 66.

The spelling of 77665656792 in words is "seventy-seven billion, six hundred sixty-five million, six hundred fifty-six thousand, seven hundred ninety-two".