2156110661660 has 24 divisors (see below), whose sum is σ = 4571791931616. Its totient is φ = 854071018560.

The previous prime is 2156110661647. The next prime is 2156110661669. The reversal of 2156110661660 is 661660116512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156110661669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523325771 + ... + 523329890.

It is an arithmetic number, because the mean of its divisors is an integer number (190491330484).

Almost surely, 2^{2156110661660} is an apocalyptic number.

2156110661660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156110661660 is an abundant number, since it is smaller than the sum of its proper divisors (2415681269956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156110661660 is a wasteful number, since it uses less digits than its factorization.

2156110661660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046655773 (or 1046655771 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 2156110661660 in words is "two trillion, one hundred fifty-six billion, one hundred ten million, six hundred sixty-one thousand, six hundred sixty".