55215345550 has 24 divisors (see below), whose sum is σ = 102897713232. Its totient is φ = 22043736000.

The previous prime is 55215345509. The next prime is 55215345553. The reversal of 55215345550 is 5554351255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55215345553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1033746 + ... + 1085845.

It is an arithmetic number, because the mean of its divisors is an integer number (4287404718).

Almost surely, 2^55215345550 is an apocalyptic number.

55215345550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55215345550 is a deficient number, since it is larger than the sum of its proper divisors (47682367682).

55215345550 is a wasteful number, since it uses less digits than its factorization.

55215345550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120124 (or 2120119 counting only the distinct ones).

The product of its (nonzero) digits is 375000, while the sum is 40.

The spelling of 55215345550 in words is "fifty-five billion, two hundred fifteen million, three hundred forty-five thousand, five hundred fifty".