2116656664 has 8 divisors (see below), whose sum is σ = 3968731260. Its totient is φ = 1058328328.

The previous prime is 2116656643. The next prime is 2116656667. The reversal of 2116656664 is 4666566112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 2116656664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116656667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132291034 + ... + 132291049.

Almost surely, 2^2116656664 is an apocalyptic number.

It is an amenable number.

2116656664 is a deficient number, since it is larger than the sum of its proper divisors (1852074596).

2116656664 is a wasteful number, since it uses less digits than its factorization.

2116656664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264582089 (or 264582085 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 2116656664 is about 46007.1370984981. The cubic root of 2116656664 is about 1283.9559949722.

The spelling of 2116656664 in words is "two billion, one hundred sixteen million, six hundred fifty-six thousand, six hundred sixty-four".