55999211571 has 10 divisors (see below), whose sum is σ = 83653143332. Its totient is φ = 37332807660.

The previous prime is 55999211533. The next prime is 55999211581. The reversal of 55999211571 is 17511299955.

55999211571 is a `hidden beast` number, since 5 + 59 + 9 + 9 + 2 + 11 + 571 = 666.

It is not a de Polignac number, because 55999211571 - 2³⁰ = 54925469747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55999211501) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 345674065 + ... + 345674226.

Almost surely, 2^55999211571 is an apocalyptic number.

55999211571 is a deficient number, since it is larger than the sum of its proper divisors (27653931761).

55999211571 is an equidigital number, since it uses as much as digits as its factorization.

55999211571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691348303 (or 691348294 counting only the distinct ones).

The product of its digits is 1275750, while the sum is 54.

The spelling of 55999211571 in words is "fifty-five billion, nine hundred ninety-nine million, two hundred eleven thousand, five hundred seventy-one".