551166565851 has 32 divisors (see below), whose sum is σ = 907581335040. Its totient is φ = 327737685600.

The previous prime is 551166565847. The next prime is 551166565967. The reversal of 551166565851 is 158565661155.

551166565851 is a `hidden beast` number, since 5 + 5 + 1 + 1 + 6 + 6 + 56 + 585 + 1 = 666.

It is not a de Polignac number, because 551166565851 - 2² = 551166565847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551166565801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17491615 + ... + 17523096.

It is an arithmetic number, because the mean of its divisors is an integer number (28361916720).

Almost surely, 2^551166565851 is an apocalyptic number.

551166565851 is a deficient number, since it is larger than the sum of its proper divisors (356414769189).

551166565851 is a wasteful number, since it uses less digits than its factorization.

551166565851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35014784 (or 35014778 counting only the distinct ones).

The product of its digits is 5400000, while the sum is 54.

The spelling of 551166565851 in words is "five hundred fifty-one billion, one hundred sixty-six million, five hundred sixty-five thousand, eight hundred fifty-one".