645064611655 has 16 divisors (see below), whose sum is σ = 781785378720. Its totient is φ = 510933007872.

The previous prime is 645064611619. The next prime is 645064611661. The reversal of 645064611655 is 556116460546.

645064611655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 645064611655 - 2¹⁷ = 645064480583 is a prime.

It is a super-2 number, since 2×645064611655² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645064611599 and 645064611608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 982734 + ... + 1501963.

It is an arithmetic number, because the mean of its divisors is an integer number (48861586170).

Almost surely, 2^645064611655 is an apocalyptic number.

645064611655 is a deficient number, since it is larger than the sum of its proper divisors (136720767065).

645064611655 is a wasteful number, since it uses less digits than its factorization.

645064611655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485218.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 645064611655 in words is "six hundred forty-five billion, sixty-four million, six hundred eleven thousand, six hundred fifty-five".