55165251 has 4 divisors (see below), whose sum is σ = 73553672. Its totient is φ = 36776832.

The previous prime is 55165249. The next prime is 55165273. The reversal of 55165251 is 15256155.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55165251 - 2¹ = 55165249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55165351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9194206 + ... + 9194211.

It is an arithmetic number, because the mean of its divisors is an integer number (18388418).

Almost surely, 2^55165251 is an apocalyptic number.

55165251 is a deficient number, since it is larger than the sum of its proper divisors (18388421).

55165251 is a wasteful number, since it uses less digits than its factorization.

55165251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18388420.

The product of its digits is 7500, while the sum is 30.

The square root of 55165251 is about 7427.3313511651. The cubic root of 55165251 is about 380.6757390143.

The spelling of 55165251 in words is "fifty-five million, one hundred sixty-five thousand, two hundred fifty-one".