12172972457 has 2 divisors, whose sum is σ = 12172972458. Its totient is φ = 12172972456.

The previous prime is 12172972393. The next prime is 12172972463. The reversal of 12172972457 is 75427927121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8002912681 + 4170059776 = 89459^2 + 64576^2 .

It is a cyclic number.

It is not a de Polignac number, because 12172972457 - 2⁶ = 12172972393 is a prime.

It is not a weakly prime, because it can be changed into another prime (12172972057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6086486228 + 6086486229.

It is an arithmetic number, because the mean of its divisors is an integer number (6086486229).

Almost surely, 2^12172972457 is an apocalyptic number.

It is an amenable number.

12172972457 is a deficient number, since it is larger than the sum of its proper divisors (1).

12172972457 is an equidigital number, since it uses as much as digits as its factorization.

12172972457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 47.

The spelling of 12172972457 in words is "twelve billion, one hundred seventy-two million, nine hundred seventy-two thousand, four hundred fifty-seven".