12641047816 has 72 divisors (see below), whose sum is σ = 26015517630. Its totient is φ = 5738323200.

The previous prime is 12641047813. The next prime is 12641047831. The reversal of 12641047816 is 61874014621.

It can be written as a sum of positive squares in only one way, i.e., 9294888100 + 3346159716 = 96410^2 + 57846^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641047813) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40646301 + ... + 40646611.

Almost surely, 2^12641047816 is an apocalyptic number.

It is an amenable number.

12641047816 is an abundant number, since it is smaller than the sum of its proper divisors (13374469814).

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

12641047816 is an equidigital number, since it uses as much as digits as its factorization.

12641047816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 12641047816 in words is "twelve billion, six hundred forty-one million, forty-seven thousand, eight hundred sixteen".