2166759856 has 10 divisors (see below), whose sum is σ = 4198097252. Its totient is φ = 1083379920.

The previous prime is 2166759851. The next prime is 2166759877. The reversal of 2166759856 is 6589576612.

It is a junction number, because it is equal to n+sod(n) for n = 2166759797 and 2166759806.

It is not an unprimeable number, because it can be changed into a prime (2166759851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67711230 + ... + 67711261.

Almost surely, 2^2166759856 is an apocalyptic number.

It is an amenable number.

2166759856 is a deficient number, since it is larger than the sum of its proper divisors (2031337396).

2166759856 is a wasteful number, since it uses less digits than its factorization.

2166759856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135422499 (or 135422493 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The square root of 2166759856 is about 46548.4678158154. The cubic root of 2166759856 is about 1294.0078975364.

The spelling of 2166759856 in words is "two billion, one hundred sixty-six million, seven hundred fifty-nine thousand, eight hundred fifty-six".