55111102506 has 24 divisors (see below), whose sum is σ = 119708178564. Its totient is φ = 18324092160.

The previous prime is 55111102499. The next prime is 55111102561. The reversal of 55111102506 is 60520111155.

55111102506 is a `hidden beast` number, since 5 + 51 + 1 + 1 + 102 + 506 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54900707481 + 210395025 = 234309^2 + 14505^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55111102506.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3848935 + ... + 3863226.

Almost surely, 2^55111102506 is an apocalyptic number.

55111102506 is an abundant number, since it is smaller than the sum of its proper divisors (64597076058).

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

55111102506 is a wasteful number, since it uses less digits than its factorization.

55111102506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712566 (or 7712563 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 55111102506 in words is "fifty-five billion, one hundred eleven million, one hundred two thousand, five hundred six".