8143990656 has 192 divisors, whose sum is σ = 23153979600. Its totient is φ = 2533171200.

The previous prime is 8143990651. The next prime is 8143990661. The reversal of 8143990656 is 6560993418.

It is an interprime number because it is at equal distance from previous prime (8143990651) and next prime (8143990661).

It is a tau number, because it is divible by the number of its divisors (192).

It is a junction number, because it is equal to n+sod(n) for n = 8143990599 and 8143990608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8143990651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10701316 + ... + 10702076.

Almost surely, 2^8143990656 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 8143990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11576989800).

8143990656 is an abundant number, since it is smaller than the sum of its proper divisors (15009988944).

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

8143990656 is a wasteful number, since it uses less digits than its factorization.

8143990656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 8143990656 is about 90244.0616107232. The cubic root of 8143990656 is about 2011.9279420116.

The spelling of 8143990656 in words is "eight billion, one hundred forty-three million, nine hundred ninety thousand, six hundred fifty-six".