77545921017 has 12 divisors (see below), whose sum is σ = 103718668496. Its totient is φ = 51535263120.

The previous prime is 77545921001. The next prime is 77545921031. The reversal of 77545921017 is 71012954577.

It is not a de Polignac number, because 77545921017 - 2⁴ = 77545921001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77545921087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8770723 + ... + 8779559.

Almost surely, 2^77545921017 is an apocalyptic number.

It is an amenable number.

77545921017 is a deficient number, since it is larger than the sum of its proper divisors (26172747479).

77545921017 is an frugal number, since it uses more digits than its factorization.

77545921017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18008 (or 9171 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 48.

The spelling of 77545921017 in words is "seventy-seven billion, five hundred forty-five million, nine hundred twenty-one thousand, seventeen".