2166571612 has 6 divisors (see below), whose sum is σ = 3791500328. Its totient is φ = 1083285804.

The previous prime is 2166571609. The next prime is 2166571621. The reversal of 2166571612 is 2161756612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270821448 + ... + 270821455.

Almost surely, 2^2166571612 is an apocalyptic number.

It is an amenable number.

2166571612 is a deficient number, since it is larger than the sum of its proper divisors (1624928716).

2166571612 is a wasteful number, since it uses less digits than its factorization.

2166571612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541642907 (or 541642905 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 2166571612 is about 46546.4457504545. The cubic root of 2166571612 is about 1293.9704227979.

The spelling of 2166571612 in words is "two billion, one hundred sixty-six million, five hundred seventy-one thousand, six hundred twelve".