645163056 has 240 divisors, whose sum is σ = 2037619584. Its totient is φ = 196826112.

The previous prime is 645163037. The next prime is 645163061. The reversal of 645163056 is 650361546.

645163056 is a `hidden beast` number, since 64 + 516 + 30 + 56 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 645163056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2842015 + ... + 2842241.

Almost surely, 2^645163056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645163056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1018809792).

645163056 is an abundant number, since it is smaller than the sum of its proper divisors (1392456528).

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

645163056 is a wasteful number, since it uses less digits than its factorization.

645163056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 292 counting only the distinct ones).

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

The square root of 645163056 is about 25400.0601574091. The cubic root of 645163056 is about 864.0850610699.

The spelling of 645163056 in words is "six hundred forty-five million, one hundred sixty-three thousand, fifty-six".