645227426272 has 48 divisors (see below), whose sum is σ = 1492370438832. Its totient is φ = 270724792320.

The previous prime is 645227426243. The next prime is 645227426309. The reversal of 645227426272 is 272624722546.

It is a super-2 number, since 2×645227426272² (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 7 ways as a sum of consecutive naturals, for example, 70496673 + ... + 70505824.

It is an arithmetic number, because the mean of its divisors is an integer number (31091050809).

Almost surely, 2^645227426272 is an apocalyptic number.

It is an amenable number.

645227426272 is an abundant number, since it is smaller than the sum of its proper divisors (847143012560).

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

645227426272 is a wasteful number, since it uses less digits than its factorization.

645227426272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141002531 (or 141002523 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 49.

The spelling of 645227426272 in words is "six hundred forty-five billion, two hundred twenty-seven million, four hundred twenty-six thousand, two hundred seventy-two".