55172799 has 16 divisors (see below), whose sum is σ = 89168640. Its totient is φ = 33437880.

The previous prime is 55172771. The next prime is 55172801. The reversal of 55172799 is 99727155.

55172799 is a `hidden beast` number, since 551 + 7 + 2 + 7 + 99 = 666.

It is not a de Polignac number, because 55172799 - 2¹¹ = 55170751 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55172749) 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, 92587 + ... + 93180.

It is an arithmetic number, because the mean of its divisors is an integer number (5573040).

Almost surely, 2^55172799 is an apocalyptic number.

55172799 is a deficient number, since it is larger than the sum of its proper divisors (33995841).

55172799 is a wasteful number, since it uses less digits than its factorization.

55172799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185787 (or 185781 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 55172799 is about 7427.8394570696. The cubic root of 55172799 is about 380.6931002419.

The spelling of 55172799 in words is "fifty-five million, one hundred seventy-two thousand, seven hundred ninety-nine".