2118666979656 has 48 divisors (see below), whose sum is σ = 5741225202960. Its totient is φ = 705832320480.

The previous prime is 2118666979633. The next prime is 2118666979661. The reversal of 2118666979656 is 6569796668112.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7993830 + ... + 8254613.

It is an arithmetic number, because the mean of its divisors is an integer number (119608858395).

Almost surely, 2^{2118666979656} is an apocalyptic number.

It is an amenable number.

2118666979656 is an abundant number, since it is smaller than the sum of its proper divisors (3622558223304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2118666979656 is a wasteful number, since it uses less digits than its factorization.

2118666979656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16250266 (or 16250259 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 2118666979656 in words is "two trillion, one hundred eighteen billion, six hundred sixty-six million, nine hundred seventy-nine thousand, six hundred fifty-six".