2155869612 has 36 divisors (see below), whose sum is σ = 5868757440. Its totient is φ = 663344352.

The previous prime is 2155869607. The next prime is 2155869613. The reversal of 2155869612 is 2169685512.

2155869612 is a `hidden beast` number, since 2 + 1 + 5 + 586 + 9 + 61 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (2155869613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2302812 + ... + 2303747.

It is an arithmetic number, because the mean of its divisors is an integer number (163021040).

Almost surely, 2^2155869612 is an apocalyptic number.

It is an amenable number.

2155869612 is an abundant number, since it is smaller than the sum of its proper divisors (3712887828).

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

2155869612 is a wasteful number, since it uses less digits than its factorization.

2155869612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606582 (or 4606577 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 2155869612 is about 46431.3429915612. The cubic root of 2155869612 is about 1291.8363390864.

The spelling of 2155869612 in words is "two billion, one hundred fifty-five million, eight hundred sixty-nine thousand, six hundred twelve".