645607979712 has 112 divisors (see below), whose sum is σ = 1963415224800. Its totient is φ = 207781862400.

The previous prime is 645607979693. The next prime is 645607979713. The reversal of 645607979712 is 217979706546.

645607979712 is a `hidden beast` number, since 6 + 4 + 5 + 607 + 9 + 7 + 9 + 7 + 12 = 666.

645607979712 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645607979712.

It is not an unprimeable number, because it can be changed into a prime (645607979713) 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, 6391539 + ... + 6491762.

Almost surely, 2^645607979712 is an apocalyptic number.

It is an amenable number.

645607979712 is an abundant number, since it is smaller than the sum of its proper divisors (1317807245088).

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

645607979712 is a wasteful number, since it uses less digits than its factorization.

645607979712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12883351 (or 12883335 counting only the distinct ones).

The product of its (nonzero) digits is 40007520, while the sum is 63.

The spelling of 645607979712 in words is "six hundred forty-five billion, six hundred seven million, nine hundred seventy-nine thousand, seven hundred twelve".