77417721689 has 16 divisors (see below), whose sum is σ = 101600839680. Its totient is φ = 57150470160.

The previous prime is 77417721679. The next prime is 77417721707. The reversal of 77417721689 is 98612771477.

It is not a de Polignac number, because 77417721689 - 2²⁸ = 77149286233 is a prime.

It is a super-2 number, since 2×77417721689² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77417721679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26457089 + ... + 26460014.

It is an arithmetic number, because the mean of its divisors is an integer number (6350052480).

Almost surely, 2^77417721689 is an apocalyptic number.

It is an amenable number.

77417721689 is a deficient number, since it is larger than the sum of its proper divisors (24183117991).

77417721689 is a wasteful number, since it uses less digits than its factorization.

77417721689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52917140.

The product of its digits is 8297856, while the sum is 59.

The spelling of 77417721689 in words is "seventy-seven billion, four hundred seventeen million, seven hundred twenty-one thousand, six hundred eighty-nine".