77291645109 has 32 divisors (see below), whose sum is σ = 118563471360. Its totient is φ = 43872672000.

The previous prime is 77291645087. The next prime is 77291645143. The reversal of 77291645109 is 90154619277.

It is not a de Polignac number, because 77291645109 - 2⁷ = 77291644981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77291645149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2870509 + ... + 2897309.

It is an arithmetic number, because the mean of its divisors is an integer number (3705108480).

Almost surely, 2^77291645109 is an apocalyptic number.

It is an amenable number.

77291645109 is a deficient number, since it is larger than the sum of its proper divisors (41271826251).

77291645109 is a wasteful number, since it uses less digits than its factorization.

77291645109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27721.

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 77291645109 in words is "seventy-seven billion, two hundred ninety-one million, six hundred forty-five thousand, one hundred nine".