55815925 has 12 divisors (see below), whose sum is σ = 75504096. Its totient is φ = 40593200.

The previous prime is 55815911. The next prime is 55815937. The reversal of 55815925 is 52951855.

It is not a de Polignac number, because 55815925 - 2¹⁵ = 55783157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101209 + ... + 101758.

It is an arithmetic number, because the mean of its divisors is an integer number (6292008).

Almost surely, 2^55815925 is an apocalyptic number.

55815925 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55815925 is a deficient number, since it is larger than the sum of its proper divisors (19688171).

55815925 is a wasteful number, since it uses less digits than its factorization.

55815925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202988 (or 202983 counting only the distinct ones).

The product of its digits is 90000, while the sum is 40.

The square root of 55815925 is about 7471.0056217353. The cubic root of 55815925 is about 382.1665825913.

The spelling of 55815925 in words is "fifty-five million, eight hundred fifteen thousand, nine hundred twenty-five".