55186936561 has 9 divisors (see below), whose sum is σ = 55428308299. Its totient is φ = 54946614424.

The previous prime is 55186936531. The next prime is 55186936583. The reversal of 55186936561 is 16563968155.

The square root of 55186936561 is 234919.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 54861350625 + 325585936 = 234225^2 + 18044^2 .

It is not a de Polignac number, because 55186936561 - 2¹³ = 55186928369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55186936501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 81516555 + ... + 81517231.

Almost surely, 2^55186936561 is an apocalyptic number.

55186936561 is the 234919-th square number.

55186936561 is the 117460-th centered octagonal number.

It is an amenable number.

55186936561 is a deficient number, since it is larger than the sum of its proper divisors (241371738).

55186936561 is an frugal number, since it uses more digits than its factorization.

55186936561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048 (or 1024 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 55.

The spelling of 55186936561 in words is "fifty-five billion, one hundred eighty-six million, nine hundred thirty-six thousand, five hundred sixty-one".