7901220018688 has 40 divisors (see below), whose sum is σ = 15797874566628. Its totient is φ = 3947890704384.

The previous prime is 7901220018631. The next prime is 7901220018697. The reversal of 7901220018688 is 8868100221097.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7584692257024 + 316527761664 = 2754032^2 + 562608^2 .

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, 4566481 + ... + 6054352.

Almost surely, 2^{7901220018688} is an apocalyptic number.

It is an amenable number.

7901220018688 is a deficient number, since it is larger than the sum of its proper divisors (7896654547940).

7901220018688 is a wasteful number, since it uses less digits than its factorization.

7901220018688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622304 (or 10622288 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 7901220018688 in words is "seven trillion, nine hundred one billion, two hundred twenty million, eighteen thousand, six hundred eighty-eight".