2166666635 has 16 divisors (see below), whose sum is σ = 2972215296. Its totient is φ = 1485320928.

The previous prime is 2166666629. The next prime is 2166666661. The reversal of 2166666635 is 5366666612.

It is not a de Polignac number, because 2166666635 - 2⁸ = 2166666379 is a prime.

It is a super-4 number, since 4×2166666635⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166666635.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201362 + ... + 211848.

It is an arithmetic number, because the mean of its divisors is an integer number (185763456).

Almost surely, 2^2166666635 is an apocalyptic number.

2166666635 is a deficient number, since it is larger than the sum of its proper divisors (805548661).

2166666635 is a wasteful number, since it uses less digits than its factorization.

2166666635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16402.

The product of its digits is 1399680, while the sum is 47.

The square root of 2166666635 is about 46547.4664724086. The cubic root of 2166666635 is about 1293.9893398053.

The spelling of 2166666635 in words is "two billion, one hundred sixty-six million, six hundred sixty-six thousand, six hundred thirty-five".