645064336344 has 32 divisors (see below), whose sum is σ = 1612722489840. Its totient is φ = 215013225600.

The previous prime is 645064336327. The next prime is 645064336351. The reversal of 645064336344 is 443633460546.

It is a super-2 number, since 2×645064336344² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645064336293 and 645064336302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144354 + ... + 1144974.

Almost surely, 2^645064336344 is an apocalyptic number.

It is an amenable number.

645064336344 is an abundant number, since it is smaller than the sum of its proper divisors (967658153496).

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

645064336344 is a wasteful number, since it uses less digits than its factorization.

645064336344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027491 (or 1027487 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 48.

The spelling of 645064336344 in words is "six hundred forty-five billion, sixty-four million, three hundred thirty-six thousand, three hundred forty-four".