18572561297 has 2 divisors, whose sum is σ = 18572561298. Its totient is φ = 18572561296.

The previous prime is 18572561257. The next prime is 18572561299. The reversal of 18572561297 is 79216527581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11938621696 + 6633939601 = 109264^2 + 81449^2 .

It is an emirp because it is prime and its reverse (79216527581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18572561297 - 2¹⁸ = 18572299153 is a prime.

Together with 18572561299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18572561299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9286280648 + 9286280649.

It is an arithmetic number, because the mean of its divisors is an integer number (9286280649).

Almost surely, 2^18572561297 is an apocalyptic number.

It is an amenable number.

18572561297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18572561297 is an equidigital number, since it uses as much as digits as its factorization.

18572561297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 53.

The spelling of 18572561297 in words is "eighteen billion, five hundred seventy-two million, five hundred sixty-one thousand, two hundred ninety-seven".