55366251 has 4 divisors (see below), whose sum is σ = 73821672. Its totient is φ = 36910832.

The previous prime is 55366243. The next prime is 55366253. The reversal of 55366251 is 15266355.

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

It is a cyclic number.

It is not a de Polignac number, because 55366251 - 2³ = 55366243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55366253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9227706 + ... + 9227711.

It is an arithmetic number, because the mean of its divisors is an integer number (18455418).

Almost surely, 2^55366251 is an apocalyptic number.

55366251 is a deficient number, since it is larger than the sum of its proper divisors (18455421).

55366251 is a wasteful number, since it uses less digits than its factorization.

55366251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18455420.

The product of its digits is 27000, while the sum is 33.

The square root of 55366251 is about 7440.8501530403. The cubic root of 55366251 is about 381.1375217419.

The spelling of 55366251 in words is "fifty-five million, three hundred sixty-six thousand, two hundred fifty-one".