55123023550 has 48 divisors (see below), whose sum is σ = 120955686912. Its totient is φ = 18289663200.

The previous prime is 55123023547. The next prime is 55123023587. The reversal of 55123023550 is 5532032155.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

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, 2529382 + ... + 2551081.

It is an arithmetic number, because the mean of its divisors is an integer number (2519910144).

Almost surely, 2^55123023550 is an apocalyptic number.

55123023550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55123023550 is an abundant number, since it is smaller than the sum of its proper divisors (65832663362).

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

55123023550 is a wasteful number, since it uses less digits than its factorization.

55123023550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080513 (or 5080508 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 31.

The spelling of 55123023550 in words is "fifty-five billion, one hundred twenty-three million, twenty-three thousand, five hundred fifty".