2166787995 has 16 divisors (see below), whose sum is σ = 3497543712. Its totient is φ = 1145392640.

The previous prime is 2166787991. The next prime is 2166788003. The reversal of 2166787995 is 5997876612.

It is not a de Polignac number, because 2166787995 - 2² = 2166787991 is a prime.

It is a super-2 number, since 2×2166787995² = 9389940430552240050, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 637476 + ... + 640865.

It is an arithmetic number, because the mean of its divisors is an integer number (218596482).

Almost surely, 2^2166787995 is an apocalyptic number.

2166787995 is a deficient number, since it is larger than the sum of its proper divisors (1330755717).

2166787995 is a wasteful number, since it uses less digits than its factorization.

2166787995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278462.

The product of its digits is 11430720, while the sum is 60.

The square root of 2166787995 is about 46548.7700696807. The cubic root of 2166787995 is about 1294.0134991310.

The spelling of 2166787995 in words is "two billion, one hundred sixty-six million, seven hundred eighty-seven thousand, nine hundred ninety-five".