645304626624 has 84 divisors (see below), whose sum is σ = 1986122559624. Its totient is φ = 184372747776.

The previous prime is 645304626607. The next prime is 645304626641. The reversal of 645304626624 is 426626403546.

645304626624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645304626607) and next prime (645304626641).

It is a tau number, because it is divible by the number of its divisors (84).

It is a super-2 number, since 2×645304626624² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 34286119 + ... + 34304934.

It is an arithmetic number, because the mean of its divisors is an integer number (23644316186).

Almost surely, 2^645304626624 is an apocalyptic number.

645304626624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

645304626624 is an abundant number, since it is smaller than the sum of its proper divisors (1340817933000).

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

645304626624 is a wasteful number, since it uses less digits than its factorization.

645304626624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68591082 (or 68591065 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 48.

The spelling of 645304626624 in words is "six hundred forty-five billion, three hundred four million, six hundred twenty-six thousand, six hundred twenty-four".