2166787994 has 8 divisors (see below), whose sum is σ = 3714493728. Its totient is φ = 928623420.

The previous prime is 2166787991. The next prime is 2166788003. The reversal of 2166787994 is 4997876612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2166787991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77385272 + ... + 77385299.

It is an arithmetic number, because the mean of its divisors is an integer number (464311716).

Almost surely, 2^2166787994 is an apocalyptic number.

2166787994 is a deficient number, since it is larger than the sum of its proper divisors (1547705734).

2166787994 is a wasteful number, since it uses less digits than its factorization.

2166787994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154770580.

The product of its digits is 9144576, while the sum is 59.

The square root of 2166787994 is about 46548.7700589393. The cubic root of 2166787994 is about 1294.0134989319.

The spelling of 2166787994 in words is "two billion, one hundred sixty-six million, seven hundred eighty-seven thousand, nine hundred ninety-four".