551501815856 has 40 divisors (see below), whose sum is σ = 1072875170880. Its totient is φ = 274631512064.

The previous prime is 551501815847. The next prime is 551501815873. The reversal of 551501815856 is 658518105155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13481225 + ... + 13522071.

It is an arithmetic number, because the mean of its divisors is an integer number (26821879272).

Almost surely, 2^551501815856 is an apocalyptic number.

It is an amenable number.

551501815856 is a deficient number, since it is larger than the sum of its proper divisors (521373355024).

551501815856 is a wasteful number, since it uses less digits than its factorization.

551501815856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44261 (or 44255 counting only the distinct ones).

The product of its (nonzero) digits is 1200000, while the sum is 50.

The spelling of 551501815856 in words is "five hundred fifty-one billion, five hundred one million, eight hundred fifteen thousand, eight hundred fifty-six".