55816134520 has 64 divisors (see below), whose sum is σ = 128858526720. Its totient is φ = 21747567744.

The previous prime is 55816134503. The next prime is 55816134533. The reversal of 55816134520 is 2543161855.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 587029 + ... + 675451.

It is an arithmetic number, because the mean of its divisors is an integer number (2013414480).

Almost surely, 2^55816134520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55816134520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64429263360).

55816134520 is an abundant number, since it is smaller than the sum of its proper divisors (73042392200).

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

55816134520 is a wasteful number, since it uses less digits than its factorization.

55816134520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88844 (or 88840 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 55816134520 in words is "fifty-five billion, eight hundred sixteen million, one hundred thirty-four thousand, five hundred twenty".