77521469312 has 64 divisors (see below), whose sum is σ = 176581616640. Its totient is φ = 33208081920.

The previous prime is 77521469303. The next prime is 77521469323. The reversal of 77521469312 is 21396412577.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2030237 + ... + 2068067.

It is an arithmetic number, because the mean of its divisors is an integer number (2759087760).

Almost surely, 2^77521469312 is an apocalyptic number.

It is an amenable number.

77521469312 is an abundant number, since it is smaller than the sum of its proper divisors (99060147328).

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

77521469312 is a wasteful number, since it uses less digits than its factorization.

77521469312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40139 (or 40127 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The spelling of 77521469312 in words is "seventy-seven billion, five hundred twenty-one million, four hundred sixty-nine thousand, three hundred twelve".