12720834566 has 32 divisors (see below), whose sum is σ = 21317015808. Its totient is φ = 5643217440.

The previous prime is 12720834563. The next prime is 12720834587. The reversal of 12720834566 is 66543802721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720834563) 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, 1364216 + ... + 1373508.

It is an arithmetic number, because the mean of its divisors is an integer number (666156744).

Almost surely, 2^12720834566 is an apocalyptic number.

12720834566 is a deficient number, since it is larger than the sum of its proper divisors (8596181242).

12720834566 is a wasteful number, since it uses less digits than its factorization.

12720834566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10796.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 12720834566 in words is "twelve billion, seven hundred twenty million, eight hundred thirty-four thousand, five hundred sixty-six".