645622704564 has 48 divisors (see below), whose sum is σ = 1528251012288. Its totient is φ = 212113984768.

The previous prime is 645622704563. The next prime is 645622704577. The reversal of 645622704564 is 465407226546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645622704563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1023249 + ... + 1529144.

It is an arithmetic number, because the mean of its divisors is an integer number (31838562756).

Almost surely, 2^645622704564 is an apocalyptic number.

It is an amenable number.

645622704564 is an abundant number, since it is smaller than the sum of its proper divisors (882628307724).

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

645622704564 is a wasteful number, since it uses less digits than its factorization.

645622704564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552704 (or 2552702 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 51.

The spelling of 645622704564 in words is "six hundred forty-five billion, six hundred twenty-two million, seven hundred four thousand, five hundred sixty-four".