645053616 has 60 divisors (see below), whose sum is σ = 1807706472. Its totient is φ = 214725888.

The previous prime is 645053603. The next prime is 645053639. The reversal of 645053616 is 616350546.

645053616 is a `hidden beast` number, since 64 + 50 + 536 + 16 = 666.

645053616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120795 + ... + 126021.

Almost surely, 2^645053616 is an apocalyptic number.

It is an amenable number.

645053616 is an abundant number, since it is smaller than the sum of its proper divisors (1162652856).

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

645053616 is a wasteful number, since it uses less digits than its factorization.

645053616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6098 (or 6089 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 645053616 is about 25397.9057404346. The cubic root of 645053616 is about 864.0361996150.

It can be divided in two parts, 64505 and 3616, that added together give a square (68121 = 261²).

The spelling of 645053616 in words is "six hundred forty-five million, fifty-three thousand, six hundred sixteen".