2156336680 has 32 divisors (see below), whose sum is σ = 4910220000. Its totient is φ = 852141376.

The previous prime is 2156336659. The next prime is 2156336701. The reversal of 2156336680 is 866336512.

It is an interprime number because it is at equal distance from previous prime (2156336659) and next prime (2156336701).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321430 + ... + 328069.

It is an arithmetic number, because the mean of its divisors is an integer number (153444375).

Almost surely, 2^2156336680 is an apocalyptic number.

2156336680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156336680 is an abundant number, since it is smaller than the sum of its proper divisors (2753883320).

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

2156336680 is a wasteful number, since it uses less digits than its factorization.

2156336680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649593 (or 649589 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 2156336680 is about 46436.3723820025. The cubic root of 2156336680 is about 1291.9296242343.

The spelling of 2156336680 in words is "two billion, one hundred fifty-six million, three hundred thirty-six thousand, six hundred eighty".