2155397712 has 160 divisors (see below), whose sum is σ = 6299596800. Its totient is φ = 630068736.

The previous prime is 2155397611. The next prime is 2155397749. The reversal of 2155397712 is 2177935512.

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, 2568589 + ... + 2569427.

It is an arithmetic number, because the mean of its divisors is an integer number (39372480).

Almost surely, 2^2155397712 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 2155397712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3149798400).

2155397712 is an abundant number, since it is smaller than the sum of its proper divisors (4144199088).

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

2155397712 is a wasteful number, since it uses less digits than its factorization.

2155397712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 1059 counting only the distinct ones).

The product of its digits is 132300, while the sum is 42.

The square root of 2155397712 is about 46426.2610167995. The cubic root of 2155397712 is about 1291.7420751831.

The spelling of 2155397712 in words is "two billion, one hundred fifty-five million, three hundred ninety-seven thousand, seven hundred twelve".