645533562764 has 24 divisors (see below), whose sum is σ = 1132255300176. Its totient is φ = 322032200000.

The previous prime is 645533562719. The next prime is 645533562767. The reversal of 645533562764 is 467265335546.

645533562764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645533562767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33645254 + ... + 33664434.

It is an arithmetic number, because the mean of its divisors is an integer number (47177304174).

Almost surely, 2^645533562764 is an apocalyptic number.

It is an amenable number.

645533562764 is a deficient number, since it is larger than the sum of its proper divisors (486721737412).

645533562764 is a wasteful number, since it uses less digits than its factorization.

645533562764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37897 (or 37895 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 56.

The spelling of 645533562764 in words is "six hundred forty-five billion, five hundred thirty-three million, five hundred sixty-two thousand, seven hundred sixty-four".