77764034635521 has 8 divisors (see below), whose sum is σ = 111661177938240. Its totient is φ = 47854790544912.

The previous prime is 77764034635493. The next prime is 77764034635523. The reversal of 77764034635521 is 12553643046777.

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

It is not a de Polignac number, because 77764034635521 - 2⁵ = 77764034635489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77764034635523) 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, 996974802981 + ... + 996974803058.

It is an arithmetic number, because the mean of its divisors is an integer number (13957647242280).

Almost surely, 2^{77764034635521} is an apocalyptic number.

It is an amenable number.

77764034635521 is a deficient number, since it is larger than the sum of its proper divisors (33897143302719).

77764034635521 is a wasteful number, since it uses less digits than its factorization.

77764034635521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993949606055.

The product of its (nonzero) digits is 88905600, while the sum is 60.

The spelling of 77764034635521 in words is "seventy-seven trillion, seven hundred sixty-four billion, thirty-four million, six hundred thirty-five thousand, five hundred twenty-one".