2215666656612 has 36 divisors (see below), whose sum is σ = 5601171663360. Its totient is φ = 738495060912.

The previous prime is 2215666656547. The next prime is 2215666656641. The reversal of 2215666656612 is 2166566665122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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, 2073748 + ... + 2954955.

It is an arithmetic number, because the mean of its divisors is an integer number (155588101760).

Almost surely, 2^{2215666656612} is an apocalyptic number.

It is an amenable number.

2215666656612 is an abundant number, since it is smaller than the sum of its proper divisors (3385505006748).

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

2215666656612 is a wasteful number, since it uses less digits than its factorization.

2215666656612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5040952 (or 5040947 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 2215666656612 in words is "two trillion, two hundred fifteen billion, six hundred sixty-six million, six hundred fifty-six thousand, six hundred twelve".