551021646456 has 48 divisors (see below), whose sum is σ = 1547622531000. Its totient is φ = 183673881504.

The previous prime is 551021646449. The next prime is 551021646479. The reversal of 551021646456 is 654646120155.

551021646456 is a `hidden beast` number, since 5 + 510 + 21 + 6 + 4 + 64 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141721731 + ... + 141725618.

Almost surely, 2^551021646456 is an apocalyptic number.

It is an amenable number.

551021646456 is an abundant number, since it is smaller than the sum of its proper divisors (996600884544).

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

551021646456 is a wasteful number, since it uses less digits than its factorization.

551021646456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283447370 (or 283447354 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 551021646456 in words is "five hundred fifty-one billion, twenty-one million, six hundred forty-six thousand, four hundred fifty-six".