2156902147989 has 12 divisors (see below), whose sum is σ = 3115927896172. Its totient is φ = 1437748963200.

The previous prime is 2156902147987. The next prime is 2156902147999. The reversal of 2156902147989 is 9897412096512.

2156902147989 is a `hidden beast` number, since 2 + 1 + 5 + 69 + 0 + 21 + 479 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 277170660900 + 1879731487089 = 526470^2 + 1371033^2 .

It is not a de Polignac number, because 2156902147989 - 2¹ = 2156902147987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156902147987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15409972 + ... + 15549309.

Almost surely, 2^{2156902147989} is an apocalyptic number.

It is an amenable number.

2156902147989 is a deficient number, since it is larger than the sum of its proper divisors (959025748183).

2156902147989 is a wasteful number, since it uses less digits than its factorization.

2156902147989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30967028 (or 30967025 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 2156902147989 in words is "two trillion, one hundred fifty-six billion, nine hundred two million, one hundred forty-seven thousand, nine hundred eighty-nine".