77757216641 has 16 divisors (see below), whose sum is σ = 86453875200. Its totient is φ = 69449218560.

The previous prime is 77757216631. The next prime is 77757216659. The reversal of 77757216641 is 14661275777.

It is a cyclic number.

It is not a de Polignac number, because 77757216641 - 2²² = 77753022337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77757216601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3354710 + ... + 3377808.

It is an arithmetic number, because the mean of its divisors is an integer number (5403367200).

Almost surely, 2^77757216641 is an apocalyptic number.

It is an amenable number.

77757216641 is a deficient number, since it is larger than the sum of its proper divisors (8696658559).

77757216641 is a wasteful number, since it uses less digits than its factorization.

77757216641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31496.

The product of its digits is 3457440, while the sum is 53.

The spelling of 77757216641 in words is "seventy-seven billion, seven hundred fifty-seven million, two hundred sixteen thousand, six hundred forty-one".