55661155 has 16 divisors (see below), whose sum is σ = 73094400. Its totient is φ = 40353760.

The previous prime is 55661147. The next prime is 55661171. The reversal of 55661155 is 55116655.

It is not a de Polignac number, because 55661155 - 2³ = 55661147 is a prime.

It is a super-3 number, since 3×55661155³ (a number of 24 digits) contains 333 as substring.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 55661155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18336 + ... + 21154.

It is an arithmetic number, because the mean of its divisors is an integer number (4568400).

Almost surely, 2^55661155 is an apocalyptic number.

55661155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55661155 is a deficient number, since it is larger than the sum of its proper divisors (17433245).

55661155 is a wasteful number, since it uses less digits than its factorization.

55661155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194.

The product of its digits is 22500, while the sum is 34.

The square root of 55661155 is about 7460.6403880632. The cubic root of 55661155 is about 381.8130235423.

The spelling of 55661155 in words is "fifty-five million, six hundred sixty-one thousand, one hundred fifty-five".