645557704012 has 12 divisors (see below), whose sum is σ = 1216627980736. Its totient is φ = 297949709520.

The previous prime is 645557704009. The next prime is 645557704021. The reversal of 645557704012 is 210407755546.

645557704012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645557704012² (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, 6207285564 + ... + 6207285667.

Almost surely, 2^645557704012 is an apocalyptic number.

It is an amenable number.

645557704012 is a deficient number, since it is larger than the sum of its proper divisors (571070276724).

645557704012 is a wasteful number, since it uses less digits than its factorization.

645557704012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12414571248 (or 12414571246 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 645557704012 in words is "six hundred forty-five billion, five hundred fifty-seven million, seven hundred four thousand, twelve".