55566110691 has 72 divisors (see below), whose sum is σ = 100721746944. Its totient is φ = 29259014400.

The previous prime is 55566110659. The next prime is 55566110731. The reversal of 55566110691 is 19601166555.

55566110691 is a `hidden beast` number, since 5 + 556 + 6 + 1 + 1 + 0 + 6 + 91 = 666.

It is not a de Polignac number, because 55566110691 - 2⁵ = 55566110659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55566110651) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3437470 + ... + 3453596.

It is an arithmetic number, because the mean of its divisors is an integer number (1398913152).

Almost surely, 2^55566110691 is an apocalyptic number.

55566110691 is a deficient number, since it is larger than the sum of its proper divisors (45155636253).

55566110691 is a wasteful number, since it uses less digits than its factorization.

55566110691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16761 (or 16751 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 55566110691 in words is "fifty-five billion, five hundred sixty-six million, one hundred ten thousand, six hundred ninety-one".