645064611630 has 32 divisors (see below), whose sum is σ = 1548183435264. Its totient is φ = 172014077856.

The previous prime is 645064611619. The next prime is 645064611661. The reversal of 645064611630 is 36116460546.

645064611630 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645064611630² (a number of 24 digits) contains 22 as substring.

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, 1799139 + ... + 2127681.

It is an arithmetic number, because the mean of its divisors is an integer number (48380732352).

Almost surely, 2^645064611630 is an apocalyptic number.

645064611630 is an abundant number, since it is smaller than the sum of its proper divisors (903118823634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645064611630 is a wasteful number, since it uses less digits than its factorization.

645064611630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394000.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 645064611630 in words is "six hundred forty-five billion, sixty-four million, six hundred eleven thousand, six hundred thirty".