645164418 has 64 divisors (see below), whose sum is σ = 1382883840. Its totient is φ = 200080512.

The previous prime is 645164417. The next prime is 645164459. The reversal of 645164418 is 814461546.

It is not an unprimeable number, because it can be changed into a prime (645164413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2768830 + ... + 2769062.

It is an arithmetic number, because the mean of its divisors is an integer number (21607560).

Almost surely, 2^645164418 is an apocalyptic number.

645164418 is an abundant number, since it is smaller than the sum of its proper divisors (737719422).

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

645164418 is a wasteful number, since it uses less digits than its factorization.

645164418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591.

The product of its digits is 92160, while the sum is 39.

The square root of 645164418 is about 25400.0869683550. The cubic root of 645164418 is about 864.0856691244.

The spelling of 645164418 in words is "six hundred forty-five million, one hundred sixty-four thousand, four hundred eighteen".