55540155 has 32 divisors (see below), whose sum is σ = 97297920. Its totient is φ = 26830080.

The previous prime is 55540123. The next prime is 55540159. The reversal of 55540155 is 55104555.

It is not a de Polignac number, because 55540155 - 2⁵ = 55540123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55540159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67074 + ... + 67896.

It is an arithmetic number, because the mean of its divisors is an integer number (3040560).

Almost surely, 2^55540155 is an apocalyptic number.

55540155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55540155 is a deficient number, since it is larger than the sum of its proper divisors (41757765).

55540155 is a wasteful number, since it uses less digits than its factorization.

55540155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its (nonzero) digits is 12500, while the sum is 30.

The square root of 55540155 is about 7452.5267527195. The cubic root of 55540155 is about 381.5361524554.

Subtracting from 55540155 its reverse (55104555), we obtain a square (435600 = 660²).

The spelling of 55540155 in words is "fifty-five million, five hundred forty thousand, one hundred fifty-five".