645065616512 has 32 divisors (see below), whose sum is σ = 1292270986800. Its totient is φ = 320730937600.

The previous prime is 645065616491. The next prime is 645065616577. The reversal of 645065616512 is 215616560546.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×645065616512² (a number of 24 digits) contains 22 as substring.

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, 14054114 + ... + 14099937.

Almost surely, 2^645065616512 is an apocalyptic number.

It is an amenable number.

645065616512 is an abundant number, since it is smaller than the sum of its proper divisors (647205370288).

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

645065616512 is a wasteful number, since it uses less digits than its factorization.

645065616512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28154244 (or 28154232 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 645065616512 in words is "six hundred forty-five billion, sixty-five million, six hundred sixteen thousand, five hundred twelve".