8721556662 has 64 divisors (see below), whose sum is σ = 22598392320. Its totient is φ = 2179125504.

The previous prime is 8721556651. The next prime is 8721556759. The reversal of 8721556662 is 2666551278.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409983 + ... + 430730.

It is an arithmetic number, because the mean of its divisors is an integer number (353099880).

Almost surely, 2^8721556662 is an apocalyptic number.

8721556662 is an abundant number, since it is smaller than the sum of its proper divisors (13876835658).

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

8721556662 is a wasteful number, since it uses less digits than its factorization.

8721556662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840757.

The product of its digits is 1209600, while the sum is 48.

The square root of 8721556662 is about 93389.2748767223. The cubic root of 8721556662 is about 2058.4074049817.

The spelling of 8721556662 in words is "eight billion, seven hundred twenty-one million, five hundred fifty-six thousand, six hundred sixty-two".