8663721696 has 576 divisors, whose sum is σ = 32267289600. Its totient is φ = 2145927168.

The previous prime is 8663721659. The next prime is 8663721733. The reversal of 8663721696 is 6961273668.

It is an interprime number because it is at equal distance from previous prime (8663721659) and next prime (8663721733).

It is a super-2 number, since 2×8663721696² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22859235 + ... + 22859613.

It is an arithmetic number, because the mean of its divisors is an integer number (56019600).

Almost surely, 2^8663721696 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 8663721696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16133644800).

8663721696 is an abundant number, since it is smaller than the sum of its proper divisors (23603567904).

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

8663721696 is a wasteful number, since it uses less digits than its factorization.

8663721696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 460 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 8663721696 is about 93079.1152514891. The cubic root of 8663721696 is about 2053.8473611419.

The spelling of 8663721696 in words is "eight billion, six hundred sixty-three million, seven hundred twenty-one thousand, six hundred ninety-six".