2166640512 has 32 divisors (see below), whose sum is σ = 5755139880. Its totient is φ = 722213376.

The previous prime is 2166640507. The next prime is 2166640529. The reversal of 2166640512 is 2150466612.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×2166640512² = 9388662216479244288, which contains 22 as substring.

It is a congruent number.

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, 2820763 + ... + 2821530.

Almost surely, 2^2166640512 is an apocalyptic number.

It is an amenable number.

2166640512 is an abundant number, since it is smaller than the sum of its proper divisors (3588499368).

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

2166640512 is an equidigital number, since it uses as much as digits as its factorization.

2166640512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642310 (or 5642298 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2166640512 is about 46547.1858655279. The cubic root of 2166640512 is about 1293.9841393407.

The spelling of 2166640512 in words is "two billion, one hundred sixty-six million, six hundred forty thousand, five hundred twelve".