2105256556 has 12 divisors (see below), whose sum is σ = 3967598992. Its totient is φ = 971656848.

The previous prime is 2105256553. The next prime is 2105256589. The reversal of 2105256556 is 6556525012.

It is a super-2 number, since 2×2105256556² = 8864210333161962272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2105256551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20242800 + ... + 20242903.

Almost surely, 2^2105256556 is an apocalyptic number.

2105256556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2105256556 is a deficient number, since it is larger than the sum of its proper divisors (1862342436).

2105256556 is a wasteful number, since it uses less digits than its factorization.

2105256556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40485720 (or 40485718 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 2105256556 is about 45883.0748315760. The cubic root of 2105256556 is about 1281.6467566312.

The spelling of 2105256556 in words is "two billion, one hundred five million, two hundred fifty-six thousand, five hundred fifty-six".