55516156661 has 6 divisors (see below), whose sum is σ = 64580019030. Its totient is φ = 47585277096.

The previous prime is 55516156637. The next prime is 55516156667. The reversal of 55516156661 is 16665161555.

It can be written as a sum of positive squares in only one way, i.e., 30173427025 + 25342729636 = 173705^2 + 159194^2 .

It is not a de Polignac number, because 55516156661 - 2¹⁰ = 55516155637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55516156667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566491346 + ... + 566491443.

It is an arithmetic number, because the mean of its divisors is an integer number (10763336505).

Almost surely, 2^55516156661 is an apocalyptic number.

It is an amenable number.

55516156661 is a deficient number, since it is larger than the sum of its proper divisors (9063862369).

55516156661 is a wasteful number, since it uses less digits than its factorization.

55516156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132982803 (or 1132982796 counting only the distinct ones).

The product of its digits is 810000, while the sum is 47.

The spelling of 55516156661 in words is "fifty-five billion, five hundred sixteen million, one hundred fifty-six thousand, six hundred sixty-one".