55551507 has 16 divisors (see below), whose sum is σ = 81166080. Its totient is φ = 33516000.

The previous prime is 55551493. The next prime is 55551547. The reversal of 55551507 is 70515555.

It is not a de Polignac number, because 55551507 - 2¹⁰ = 55550483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55551547) 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, 3882 + ... + 11232.

It is an arithmetic number, because the mean of its divisors is an integer number (5072880).

Almost surely, 2^55551507 is an apocalyptic number.

55551507 is a deficient number, since it is larger than the sum of its proper divisors (25614573).

55551507 is a wasteful number, since it uses less digits than its factorization.

55551507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7594.

The product of its (nonzero) digits is 21875, while the sum is 33.

The square root of 55551507 is about 7453.2883346883. The cubic root of 55551507 is about 381.5621450809.

The spelling of 55551507 in words is "fifty-five million, five hundred fifty-one thousand, five hundred seven".