2155556612 has 24 divisors (see below), whose sum is σ = 4331742240. Its totient is φ = 928229760.

The previous prime is 2155556609. The next prime is 2155556621. The reversal of 2155556612 is 2166555512.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1288373 + ... + 1290044.

It is an arithmetic number, because the mean of its divisors is an integer number (180489260).

Almost surely, 2^2155556612 is an apocalyptic number.

2155556612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2155556612 is an abundant number, since it is smaller than the sum of its proper divisors (2176185628).

2155556612 is a wasteful number, since it uses less digits than its factorization.

2155556612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578451 (or 2578449 counting only the distinct ones).

The product of its digits is 90000, while the sum is 38.

The square root of 2155556612 is about 46427.9723011893. The cubic root of 2155556612 is about 1291.7738176269.

The spelling of 2155556612 in words is "two billion, one hundred fifty-five million, five hundred fifty-six thousand, six hundred twelve".