55115550 has 72 divisors (see below), whose sum is σ = 169240656. Its totient is φ = 12597120.

The previous prime is 55115549. The next prime is 55115591. The reversal of 55115550 is 5551155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5599 + ... + 11898.

Almost surely, 2^55115550 is an apocalyptic number.

55115550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55115550 is an abundant number, since it is smaller than the sum of its proper divisors (114125106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55115550 is a wasteful number, since it uses less digits than its factorization.

55115550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17522 (or 17514 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 27.

The square root of 55115550 is about 7423.9847790792. The cubic root of 55115550 is about 380.5613817007.

The spelling of 55115550 in words is "fifty-five million, one hundred fifteen thousand, five hundred fifty".