2156013666 has 16 divisors (see below), whose sum is σ = 4791141600. Its totient is φ = 718671204.

The previous prime is 2156013653. The next prime is 2156013667. The reversal of 2156013666 is 6663106512.

It is a self number, because there is not a number n which added to its sum of digits gives 2156013666.

It is not an unprimeable number, because it can be changed into a prime (2156013667) 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, 19963036 + ... + 19963143.

It is an arithmetic number, because the mean of its divisors is an integer number (299446350).

Almost surely, 2^2156013666 is an apocalyptic number.

2156013666 is an abundant number, since it is smaller than the sum of its proper divisors (2635127934).

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

2156013666 is a wasteful number, since it uses less digits than its factorization.

2156013666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39926190 (or 39926184 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 2156013666 is about 46432.8942238151. The cubic root of 2156013666 is about 1291.8651117058.

The spelling of 2156013666 in words is "two billion, one hundred fifty-six million, thirteen thousand, six hundred sixty-six".