2156909831919 has 72 divisors (see below), whose sum is σ = 3375791960112. Its totient is φ = 1326339256320.

The previous prime is 2156909831891. The next prime is 2156909831927. The reversal of 2156909831919 is 9191389096512.

2156909831919 is a `hidden beast` number, since 21 + 569 + 0 + 9 + 8 + 31 + 9 + 19 = 666.

It is not a de Polignac number, because 2156909831919 - 2⁵ = 2156909831887 is a prime.

It is a super-2 number, since 2×2156909831919² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156909831119) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 22509999 + ... + 22605615.

It is an arithmetic number, because the mean of its divisors is an integer number (46885999446).

Almost surely, 2^{2156909831919} is an apocalyptic number.

2156909831919 is a deficient number, since it is larger than the sum of its proper divisors (1218882128193).

2156909831919 is a wasteful number, since it uses less digits than its factorization.

2156909831919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95845 (or 95823 counting only the distinct ones).

The product of its (nonzero) digits is 9447840, while the sum is 63.

The spelling of 2156909831919 in words is "two trillion, one hundred fifty-six billion, nine hundred nine million, eight hundred thirty-one thousand, nine hundred nineteen".