2156479866 has 24 divisors (see below), whose sum is σ = 4673229600. Its totient is φ = 718694856.

The previous prime is 2156479861. The next prime is 2156479867. The reversal of 2156479866 is 6689746512.

2156479866 is a `hidden beast` number, since 2 + 1 + 564 + 79 + 8 + 6 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (2156479861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175851 + ... + 187713.

It is an arithmetic number, because the mean of its divisors is an integer number (194717900).

Almost surely, 2^2156479866 is an apocalyptic number.

2156479866 is an abundant number, since it is smaller than the sum of its proper divisors (2516749734).

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

2156479866 is a wasteful number, since it uses less digits than its factorization.

2156479866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21970 (or 21967 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 2156479866 is about 46437.9141004417. The cubic root of 2156479866 is about 1291.9582193578.

The spelling of 2156479866 in words is "two billion, one hundred fifty-six million, four hundred seventy-nine thousand, eight hundred sixty-six".