2156535900 has 90 divisors (see below), whose sum is σ = 6990663680. Its totient is φ = 575074080.

The previous prime is 2156535881. The next prime is 2156535919. The reversal of 2156535900 is 95356512.

2156535900 is a `hidden beast` number, since 2 + 1 + 5 + 65 + 3 + 590 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (2156535881) and next prime (2156535919).

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 125020 + ... + 141219.

Almost surely, 2^2156535900 is an apocalyptic number.

2156535900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156535900 is an abundant number, since it is smaller than the sum of its proper divisors (4834127780).

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

2156535900 is a wasteful number, since it uses less digits than its factorization.

2156535900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266265 (or 266249 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 2156535900 is about 46438.5174181950. The cubic root of 2156535900 is about 1291.9694093471.

The spelling of 2156535900 in words is "two billion, one hundred fifty-six million, five hundred thirty-five thousand, nine hundred".