77886716321 has 8 divisors (see below), whose sum is σ = 82305034080. Its totient is φ = 73500300288.

The previous prime is 77886716317. The next prime is 77886716339. The reversal of 77886716321 is 12361768877.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77886716321 - 2² = 77886716317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77886716381) 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, 7970411 + ... + 7980176.

It is an arithmetic number, because the mean of its divisors is an integer number (10288129260).

Almost surely, 2^77886716321 is an apocalyptic number.

It is an amenable number.

77886716321 is a deficient number, since it is larger than the sum of its proper divisors (4418317759).

77886716321 is a wasteful number, since it uses less digits than its factorization.

77886716321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15950863.

The product of its digits is 4741632, while the sum is 56.

The spelling of 77886716321 in words is "seventy-seven billion, eight hundred eighty-six million, seven hundred sixteen thousand, three hundred twenty-one".