645643808072 has 16 divisors (see below), whose sum is σ = 1210625122560. Its totient is φ = 322810442064.

The previous prime is 645643808057. The next prime is 645643808093. The reversal of 645643808072 is 270808346546.

It is a happy number.

645643808072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1190948 + ... + 1646099.

It is an arithmetic number, because the mean of its divisors is an integer number (75664070160).

Almost surely, 2^645643808072 is an apocalyptic number.

It is an amenable number.

645643808072 is a deficient number, since it is larger than the sum of its proper divisors (564981314488).

645643808072 is a wasteful number, since it uses less digits than its factorization.

645643808072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865500 (or 2865496 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 645643808072 in words is "six hundred forty-five billion, six hundred forty-three million, eight hundred eight thousand, seventy-two".