645508116 has 72 divisors (see below), whose sum is σ = 1845995424. Its totient is φ = 195605280.

The previous prime is 645508111. The next prime is 645508117. The reversal of 645508116 is 611805546.

645508116 is a `hidden beast` number, since 645 + 5 + 0 + 8 + 1 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645508111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19495 + ... + 40878.

Almost surely, 2^645508116 is an apocalyptic number.

645508116 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

645508116 is an abundant number, since it is smaller than the sum of its proper divisors (1200487308).

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

645508116 is a wasteful number, since it uses less digits than its factorization.

645508116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60403 (or 60389 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 645508116 is about 25406.8517530213. The cubic root of 645508116 is about 864.2390831412.

The spelling of 645508116 in words is "six hundred forty-five million, five hundred eight thousand, one hundred sixteen".