2166256516 has 12 divisors (see below), whose sum is σ = 3826379088. Its totient is φ = 1073005352.

The previous prime is 2166256513. The next prime is 2166256523. The reversal of 2166256516 is 6156526612.

It is a super-2 number, since 2×2166256516² = 9385334586224916512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2166256513) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2530246 + ... + 2531101.

It is an arithmetic number, because the mean of its divisors is an integer number (318864924).

Almost surely, 2^2166256516 is an apocalyptic number.

It is an amenable number.

2166256516 is a deficient number, since it is larger than the sum of its proper divisors (1660122572).

2166256516 is a wasteful number, since it uses less digits than its factorization.

2166256516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061458 (or 5061456 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 2166256516 is about 46543.0608791472. The cubic root of 2166256516 is about 1293.9076900962.

The spelling of 2166256516 in words is "two billion, one hundred sixty-six million, two hundred fifty-six thousand, five hundred sixteen".