645213368740 has 48 divisors (see below), whose sum is σ = 1377384435504. Its totient is φ = 253813132800.

The previous prime is 645213368717. The next prime is 645213368771. The reversal of 645213368740 is 47863312546.

645213368740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 41086479204 + 604126889536 = 202698^2 + 777256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8086722 + ... + 8166118.

It is an arithmetic number, because the mean of its divisors is an integer number (28695509073).

Almost surely, 2^645213368740 is an apocalyptic number.

It is an amenable number.

645213368740 is an abundant number, since it is smaller than the sum of its proper divisors (732171066764).

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

645213368740 is a wasteful number, since it uses less digits than its factorization.

645213368740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86128 (or 86126 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 645213368740 in words is "six hundred forty-five billion, two hundred thirteen million, three hundred sixty-eight thousand, seven hundred forty".