2155122464 has 96 divisors (see below), whose sum is σ = 4743748800. Its totient is φ = 955468800.

The previous prime is 2155122421. The next prime is 2155122479. The reversal of 2155122464 is 4642215512.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 2155122464.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6174962 + ... + 6175310.

It is an arithmetic number, because the mean of its divisors is an integer number (49414050).

Almost surely, 2^2155122464 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 2155122464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371874400).

2155122464 is an abundant number, since it is smaller than the sum of its proper divisors (2588626336).

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

2155122464 is a wasteful number, since it uses less digits than its factorization.

2155122464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 746 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 2155122464 is about 46423.2965654099. The cubic root of 2155122464 is about 1291.6870869464.

Adding to 2155122464 its reverse (4642215512), we get a palindrome (6797337976).

The spelling of 2155122464 in words is "two billion, one hundred fifty-five million, one hundred twenty-two thousand, four hundred sixty-four".