55161565500 has 96 divisors (see below), whose sum is σ = 160835508288. Its totient is φ = 14690976000.

The previous prime is 55161565469. The next prime is 55161565513. The reversal of 55161565500 is 556516155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1172430 + ... + 1218570.

It is an arithmetic number, because the mean of its divisors is an integer number (1675369878).

Almost surely, 2^55161565500 is an apocalyptic number.

55161565500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55161565500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80417754144).

55161565500 is an abundant number, since it is smaller than the sum of its proper divisors (105673942788).

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

55161565500 is a wasteful number, since it uses less digits than its factorization.

55161565500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46960 (or 46948 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 55161565500 in words is "fifty-five billion, one hundred sixty-one million, five hundred sixty-five thousand, five hundred".