2155222512 has 160 divisors (see below), whose sum is σ = 6299279360. Its totient is φ = 705438720.

The previous prime is 2155222477. The next prime is 2155222513. The reversal of 2155222512 is 2152225512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155222513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8942712 + ... + 8942952.

It is an arithmetic number, because the mean of its divisors is an integer number (39370496).

Almost surely, 2^2155222512 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 2155222512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3149639680).

2155222512 is an abundant number, since it is smaller than the sum of its proper divisors (4144056848).

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

2155222512 is a wasteful number, since it uses less digits than its factorization.

2155222512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 536 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 2155222512 is about 46424.3741153287. The cubic root of 2155222512 is about 1291.7070747835.

The spelling of 2155222512 in words is "two billion, one hundred fifty-five million, two hundred twenty-two thousand, five hundred twelve".