55185021850 has 24 divisors (see below), whose sum is σ = 117307590048. Its totient is φ = 18920578800.

The previous prime is 55185021839. The next prime is 55185021887. The reversal of 55185021850 is 5812058155.

55185021850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 78835396 + ... + 78836095.

It is an arithmetic number, because the mean of its divisors is an integer number (4887816252).

Almost surely, 2^55185021850 is an apocalyptic number.

55185021850 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55185021850 is an abundant number, since it is smaller than the sum of its proper divisors (62122568198).

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

55185021850 is a wasteful number, since it uses less digits than its factorization.

55185021850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157671510 (or 157671505 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 40.

The spelling of 55185021850 in words is "fifty-five billion, one hundred eighty-five million, twenty-one thousand, eight hundred fifty".