2156654006217 has 12 divisors (see below), whose sum is σ = 3115183613620. Its totient is φ = 1437761622528.

The previous prime is 2156654006207. The next prime is 2156654006231. The reversal of 2156654006217 is 7126004566512.

2156654006217 is a `hidden beast` number, since 2 + 15 + 6 + 6 + 5 + 4 + 0 + 0 + 621 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1287916298496 + 868737707721 = 1134864^2 + 932061^2 .

It is not a de Polignac number, because 2156654006217 - 2¹⁶ = 2156653940681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156654006207) 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, 1505313 + ... + 2565009.

Almost surely, 2^{2156654006217} is an apocalyptic number.

It is an amenable number.

2156654006217 is a deficient number, since it is larger than the sum of its proper divisors (958529607403).

2156654006217 is a wasteful number, since it uses less digits than its factorization.

2156654006217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285832 (or 1285829 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 2156654006217 in words is "two trillion, one hundred fifty-six billion, six hundred fifty-four million, six thousand, two hundred seventeen".