55555155 has 24 divisors (see below), whose sum is σ = 99618480. Its totient is φ = 28607040.

The previous prime is 55555147. The next prime is 55555163. The reversal of 55555155 is 55155555.

It is a happy number.

55555155 is a `hidden beast` number, since 5 + 55 + 551 + 55 = 666.

It is an interprime number because it is at equal distance from previous prime (55555147) and next prime (55555163).

It is not a de Polignac number, because 55555155 - 2³ = 55555147 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19981 + ... + 22590.

It is an arithmetic number, because the mean of its divisors is an integer number (4150770).

Almost surely, 2^55555155 is an apocalyptic number.

55555155 is a deficient number, since it is larger than the sum of its proper divisors (44063325).

55555155 is a wasteful number, since it uses less digits than its factorization.

55555155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42611 (or 42608 counting only the distinct ones).

The product of its digits is 78125, while the sum is 36.

The square root of 55555155 is about 7453.5330548673. The cubic root of 55555155 is about 381.5704971389.

The spelling of 55555155 in words is "fifty-five million, five hundred fifty-five thousand, one hundred fifty-five".