2166642416 has 20 divisors (see below), whose sum is σ = 4198875600. Its totient is φ = 1083061632.

The previous prime is 2166642397. The next prime is 2166642431. The reversal of 2166642416 is 6142466612.

It is a self number, because there is not a number n which added to its sum of digits gives 2166642416.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64940 + ... + 92468.

It is an arithmetic number, because the mean of its divisors is an integer number (209943780).

Almost surely, 2^2166642416 is an apocalyptic number.

It is an amenable number.

2166642416 is a deficient number, since it is larger than the sum of its proper divisors (2032233184).

2166642416 is a wasteful number, since it uses less digits than its factorization.

2166642416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32456 (or 32450 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 2166642416 is about 46547.2063178877. The cubic root of 2166642416 is about 1293.9845183830.

The spelling of 2166642416 in words is "two billion, one hundred sixty-six million, six hundred forty-two thousand, four hundred sixteen".