18574811617 has 2 divisors, whose sum is σ = 18574811618. Its totient is φ = 18574811616.

The previous prime is 18574811611. The next prime is 18574811653. The reversal of 18574811617 is 71611847581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16404742561 + 2170069056 = 128081^2 + 46584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18574811617 is a prime.

It is not a weakly prime, because it can be changed into another prime (18574811611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9287405808 + 9287405809.

It is an arithmetic number, because the mean of its divisors is an integer number (9287405809).

Almost surely, 2^18574811617 is an apocalyptic number.

It is an amenable number.

18574811617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18574811617 is an equidigital number, since it uses as much as digits as its factorization.

18574811617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 49.

The spelling of 18574811617 in words is "eighteen billion, five hundred seventy-four million, eight hundred eleven thousand, six hundred seventeen".