55503999 has 24 divisors (see below), whose sum is σ = 83740800. Its totient is φ = 35380800.

The previous prime is 55503989. The next prime is 55504019. The reversal of 55503999 is 99930555.

55503999 is a `hidden beast` number, since 5 + 550 + 3 + 9 + 99 = 666.

It is not a de Polignac number, because 55503999 - 2⁴ = 55503983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55503989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27474 + ... + 29424.

It is an arithmetic number, because the mean of its divisors is an integer number (3489200).

Almost surely, 2^55503999 is an apocalyptic number.

55503999 is a deficient number, since it is larger than the sum of its proper divisors (28236801).

55503999 is a wasteful number, since it uses less digits than its factorization.

55503999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 2092 counting only the distinct ones).

The product of its (nonzero) digits is 273375, while the sum is 45.

The square root of 55503999 is about 7450.1006033476. The cubic root of 55503999 is about 381.4533426058.

The spelling of 55503999 in words is "fifty-five million, five hundred three thousand, nine hundred ninety-nine".