645257677311 has 16 divisors (see below), whose sum is σ = 1029470938720. Its totient is φ = 397081647360.

The previous prime is 645257677223. The next prime is 645257677313. The reversal of 645257677311 is 113776752546.

645257677311 is a `hidden beast` number, since 6 + 4 + 5 + 257 + 6 + 77 + 311 = 666.

It is not a de Polignac number, because 645257677311 - 2²¹ = 645255580159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645257677313) 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, 919170130 + ... + 919170831.

It is an arithmetic number, because the mean of its divisors is an integer number (64341933670).

Almost surely, 2^645257677311 is an apocalyptic number.

645257677311 is a deficient number, since it is larger than the sum of its proper divisors (384213261409).

645257677311 is a wasteful number, since it uses less digits than its factorization.

645257677311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838340983 (or 1838340977 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 54.

The spelling of 645257677311 in words is "six hundred forty-five billion, two hundred fifty-seven million, six hundred seventy-seven thousand, three hundred eleven".