55665666157 has 16 divisors (see below), whose sum is σ = 59450872320. Its totient is φ = 51966759600.

The previous prime is 55665666149. The next prime is 55665666209. The reversal of 55665666157 is 75166656655.

It is a cyclic number.

It is not a de Polignac number, because 55665666157 - 2³ = 55665666149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55665666127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2962482 + ... + 2981212.

It is an arithmetic number, because the mean of its divisors is an integer number (3715679520).

Almost surely, 2^55665666157 is an apocalyptic number.

It is an amenable number.

55665666157 is a deficient number, since it is larger than the sum of its proper divisors (3785206163).

55665666157 is a wasteful number, since it uses less digits than its factorization.

55665666157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21024.

The product of its digits is 34020000, while the sum is 58.

The spelling of 55665666157 in words is "fifty-five billion, six hundred sixty-five million, six hundred sixty-six thousand, one hundred fifty-seven".