2156818670105 has 16 divisors (see below), whose sum is σ = 2824452633600. Its totient is φ = 1568050440960.

The previous prime is 2156818670077. The next prime is 2156818670113. The reversal of 2156818670105 is 5010768186512.

It is not a de Polignac number, because 2156818670105 - 2¹⁰ = 2156818669081 is a prime.

It is a super-2 number, since 2×2156818670105² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6652160 + ... + 6968849.

It is an arithmetic number, because the mean of its divisors is an integer number (176528289600).

Almost surely, 2^{2156818670105} is an apocalyptic number.

It is an amenable number.

2156818670105 is a deficient number, since it is larger than the sum of its proper divisors (667633963495).

2156818670105 is a wasteful number, since it uses less digits than its factorization.

2156818670105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13623904.

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 2156818670105 in words is "two trillion, one hundred fifty-six billion, eight hundred eighteen million, six hundred seventy thousand, one hundred five".