2156043051999 has 12 divisors (see below), whose sum is σ = 3186709627816. Its totient is φ = 1403935010352.

The previous prime is 2156043051989. The next prime is 2156043052013. The reversal of 2156043051999 is 9991503406512.

2156043051999 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 0 + 4 + 30 + 519 + 99 = 666.

It is not a de Polignac number, because 2156043051999 - 2²⁸ = 2155774616543 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 (2156043051989) 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, 2785584952 + ... + 2785585725.

Almost surely, 2^{2156043051999} is an apocalyptic number.

2156043051999 is a deficient number, since it is larger than the sum of its proper divisors (1030666575817).

2156043051999 is a wasteful number, since it uses less digits than its factorization.

2156043051999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5571170726 (or 5571170723 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The spelling of 2156043051999 in words is "two trillion, one hundred fifty-six billion, forty-three million, fifty-one thousand, nine hundred ninety-nine".