645604575764 has 12 divisors (see below), whose sum is σ = 1130870863584. Its totient is φ = 322498614744.

The previous prime is 645604575719. The next prime is 645604575823. The reversal of 645604575764 is 467575406546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75913502 + ... + 75922005.

It is an arithmetic number, because the mean of its divisors is an integer number (94239238632).

Almost surely, 2^645604575764 is an apocalyptic number.

It is an amenable number.

645604575764 is a deficient number, since it is larger than the sum of its proper divisors (485266287820).

645604575764 is a wasteful number, since it uses less digits than its factorization.

645604575764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151836574 (or 151836572 counting only the distinct ones).

The product of its (nonzero) digits is 84672000, while the sum is 59.

The spelling of 645604575764 in words is "six hundred forty-five billion, six hundred four million, five hundred seventy-five thousand, seven hundred sixty-four".