551406640515660 has 72 divisors (see below), whose sum is σ = 1672602455771520. Its totient is φ = 147041567474688.

The previous prime is 551406640515659. The next prime is 551406640515667. The reversal of 551406640515660 is 66515046604155.

551406640515660 is a `hidden beast` number, since 5 + 5 + 1 + 4 + 0 + 6 + 64 + 0 + 515 + 6 + 60 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 551406640515597 and 551406640515606.

It is not an unprimeable number, because it can be changed into a prime (551406640515667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164894844 + ... + 168205596.

Almost surely, 2^{551406640515660} is an apocalyptic number.

It is an amenable number.

551406640515660 is an abundant number, since it is smaller than the sum of its proper divisors (1121195815255860).

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

551406640515660 is a wasteful number, since it uses less digits than its factorization.

551406640515660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4236047 (or 4236042 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 551406640515660 in words is "five hundred fifty-one trillion, four hundred six billion, six hundred forty million, five hundred fifteen thousand, six hundred sixty".