2156851085123 has 16 divisors (see below), whose sum is σ = 2527563540480. Its totient is φ = 1801965868416.

The previous prime is 2156851085119. The next prime is 2156851085143. The reversal of 2156851085123 is 3215801586512.

It is not a de Polignac number, because 2156851085123 - 2² = 2156851085119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156851085143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7335590 + ... + 7623947.

It is an arithmetic number, because the mean of its divisors is an integer number (157972721280).

Almost surely, 2^{2156851085123} is an apocalyptic number.

2156851085123 is a deficient number, since it is larger than the sum of its proper divisors (370712455357).

2156851085123 is a wasteful number, since it uses less digits than its factorization.

2156851085123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14960066.

The product of its (nonzero) digits is 576000, while the sum is 47.

The spelling of 2156851085123 in words is "two trillion, one hundred fifty-six billion, eight hundred fifty-one million, eighty-five thousand, one hundred twenty-three".