646529754872 has 16 divisors (see below), whose sum is σ = 1212252460560. Its totient is φ = 323262432064.

The previous prime is 646529754847. The next prime is 646529754943. The reversal of 646529754872 is 278457925646.

It is a junction number, because it is equal to n+sod(n) for n = 646529754799 and 646529754808.

It is a congruent number.

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, 1337693 + ... + 1755699.

It is an arithmetic number, because the mean of its divisors is an integer number (75765778785).

Almost surely, 2^646529754872 is an apocalyptic number.

It is an amenable number.

646529754872 is a deficient number, since it is larger than the sum of its proper divisors (565722705688).

646529754872 is a wasteful number, since it uses less digits than its factorization.

646529754872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611350 (or 611346 counting only the distinct ones).

The product of its digits is 203212800, while the sum is 65.

The spelling of 646529754872 in words is "six hundred forty-six billion, five hundred twenty-nine million, seven hundred fifty-four thousand, eight hundred seventy-two".