12457165321 has 2 divisors, whose sum is σ = 12457165322. Its totient is φ = 12457165320.

The previous prime is 12457165289. The next prime is 12457165363. The reversal of 12457165321 is 12356175421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10175765625 + 2281399696 = 100875^2 + 47764^2 .

It is a cyclic number.

It is not a de Polignac number, because 12457165321 - 2⁵ = 12457165289 is a prime.

It is not a weakly prime, because it can be changed into another prime (12457165381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6228582660 + 6228582661.

It is an arithmetic number, because the mean of its divisors is an integer number (6228582661).

Almost surely, 2^12457165321 is an apocalyptic number.

It is an amenable number.

12457165321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12457165321 is an equidigital number, since it uses as much as digits as its factorization.

12457165321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The spelling of 12457165321 in words is "twelve billion, four hundred fifty-seven million, one hundred sixty-five thousand, three hundred twenty-one".