12972160781 has 4 divisors (see below), whose sum is σ = 13419476700. Its totient is φ = 12524844864.

The previous prime is 12972160759. The next prime is 12972160801. The reversal of 12972160781 is 18706127921.

12972160781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7240308100 + 5731852681 = 85090^2 + 75709^2 .

It is a cyclic number.

It is not a de Polignac number, because 12972160781 - 2⁶ = 12972160717 is a prime.

It is a super-2 number, since 2×12972160781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12972160711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223657916 + ... + 223657973.

It is an arithmetic number, because the mean of its divisors is an integer number (3354869175).

Almost surely, 2^12972160781 is an apocalyptic number.

It is an amenable number.

12972160781 is a deficient number, since it is larger than the sum of its proper divisors (447315919).

12972160781 is an equidigital number, since it uses as much as digits as its factorization.

12972160781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447315918.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 12972160781 in words is "twelve billion, nine hundred seventy-two million, one hundred sixty thousand, seven hundred eighty-one".