2166042656 has 24 divisors (see below), whose sum is σ = 4334308524. Its totient is φ = 1065265920.

The previous prime is 2166042649. The next prime is 2166042673. The reversal of 2166042656 is 6562406612.

It can be written as a sum of positive squares in 2 ways, for example, as 1566576400 + 599466256 = 39580^2 + 24484^2 .

It is a super-2 number, since 2×2166042656² = 9383481575223068672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552875 + ... + 556778.

Almost surely, 2^2166042656 is an apocalyptic number.

It is an amenable number.

2166042656 is an abundant number, since it is smaller than the sum of its proper divisors (2168265868).

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

2166042656 is a wasteful number, since it uses less digits than its factorization.

2166042656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109724 (or 1109716 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 2166042656 is about 46540.7633800736. The cubic root of 2166042656 is about 1293.8651090810.

The spelling of 2166042656 in words is "two billion, one hundred sixty-six million, forty-two thousand, six hundred fifty-six".