645263043120 has 120 divisors (see below), whose sum is σ = 2171168973792. Its totient is φ = 171739776000.

The previous prime is 645263043119. The next prime is 645263043157. The reversal of 645263043120 is 21340362546.

645263043120 is a `hidden beast` number, since 6 + 4 + 5 + 2 + 630 + 4 + 3 + 12 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 484956 + ... + 1235195.

Almost surely, 2^645263043120 is an apocalyptic number.

645263043120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645263043120 is an abundant number, since it is smaller than the sum of its proper divisors (1525905930672).

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

645263043120 is a wasteful number, since it uses less digits than its factorization.

645263043120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720691 (or 1720682 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 645263043120 in words is "six hundred forty-five billion, two hundred sixty-three million, forty-three thousand, one hundred twenty".