7991216616 has 64 divisors (see below), whose sum is σ = 20393337600. Its totient is φ = 2608556288.

The previous prime is 7991216609. The next prime is 7991216617. The reversal of 7991216616 is 6166121997.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (7991216617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 702865 + ... + 714143.

It is an arithmetic number, because the mean of its divisors is an integer number (318645900).

Almost surely, 2^7991216616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7991216616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10196668800).

7991216616 is an abundant number, since it is smaller than the sum of its proper divisors (12402120984).

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

7991216616 is a wasteful number, since it uses less digits than its factorization.

7991216616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11898 (or 11894 counting only the distinct ones).

The product of its digits is 244944, while the sum is 48.

The square root of 7991216616 is about 89393.6050061748. The cubic root of 7991216616 is about 1999.2677832954.

The spelling of 7991216616 in words is "seven billion, nine hundred ninety-one million, two hundred sixteen thousand, six hundred sixteen".