2155998738024 has 128 divisors (see below), whose sum is σ = 6126626352000. Its totient is φ = 702317993472.

The previous prime is 2155998737999. The next prime is 2155998738037. The reversal of 2155998738024 is 4208378995512.

2155998738024 is a `hidden beast` number, since 2 + 1 + 5 + 599 + 8 + 7 + 38 + 0 + 2 + 4 = 666.

It is a super-2 number, since 2×2155998738024² (a number of 25 digits) contains 22 as substring.

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, 1091499 + ... + 2345925.

It is an arithmetic number, because the mean of its divisors is an integer number (47864268375).

Almost surely, 2^{2155998738024} is an apocalyptic number.

2155998738024 is a gapful number since it is divisible by the number (24) 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 2155998738024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3063313176000).

2155998738024 is an abundant number, since it is smaller than the sum of its proper divisors (3970627613976).

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

2155998738024 is a wasteful number, since it uses less digits than its factorization.

2155998738024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254624 (or 1254614 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 2155998738024 in words is "two trillion, one hundred fifty-five billion, nine hundred ninety-eight million, seven hundred thirty-eight thousand, twenty-four".