55815507 has 16 divisors (see below), whose sum is σ = 90207360. Its totient is φ = 33827400.

The previous prime is 55815497. The next prime is 55815523. The reversal of 55815507 is 70551855.

It is not a de Polignac number, because 55815507 - 2⁴ = 55815491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55815707) 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, 93669 + ... + 94262.

It is an arithmetic number, because the mean of its divisors is an integer number (5637960).

Almost surely, 2^55815507 is an apocalyptic number.

55815507 is a deficient number, since it is larger than the sum of its proper divisors (34391853).

55815507 is a wasteful number, since it uses less digits than its factorization.

55815507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187951 (or 187945 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 36.

The square root of 55815507 is about 7470.9776468679. The cubic root of 55815507 is about 382.1656285862.

The spelling of 55815507 in words is "fifty-five million, eight hundred fifteen thousand, five hundred seven".