2166979986 has 16 divisors (see below), whose sum is σ = 4815511200. Its totient is φ = 722326644.

The previous prime is 2166979957. The next prime is 2166980009. The reversal of 2166979986 is 6899796612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20064576 + ... + 20064683.

It is an arithmetic number, because the mean of its divisors is an integer number (300969450).

Almost surely, 2^2166979986 is an apocalyptic number.

2166979986 is an abundant number, since it is smaller than the sum of its proper divisors (2648531214).

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

2166979986 is a wasteful number, since it uses less digits than its factorization.

2166979986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40129270 (or 40129264 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 2166979986 is about 46550.8322804222. The cubic root of 2166979986 is about 1294.0517172383.

The spelling of 2166979986 in words is "two billion, one hundred sixty-six million, nine hundred seventy-nine thousand, nine hundred eighty-six".