18172507579 has 2 divisors, whose sum is σ = 18172507580. Its totient is φ = 18172507578.

The previous prime is 18172507543. The next prime is 18172507603. The reversal of 18172507579 is 97570527181.

It is a strong prime.

It is an emirp because it is prime and its reverse (97570527181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18172507579 - 2²³ = 18164118971 is a prime.

It is not a weakly prime, because it can be changed into another prime (18172508579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9086253789 + 9086253790.

It is an arithmetic number, because the mean of its divisors is an integer number (9086253790).

Almost surely, 2^18172507579 is an apocalyptic number.

18172507579 is a deficient number, since it is larger than the sum of its proper divisors (1).

18172507579 is an equidigital number, since it uses as much as digits as its factorization.

18172507579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 52.

The spelling of 18172507579 in words is "eighteen billion, one hundred seventy-two million, five hundred seven thousand, five hundred seventy-nine".