18168074501 has 2 divisors, whose sum is σ = 18168074502. Its totient is φ = 18168074500.

The previous prime is 18168074423. The next prime is 18168074537. The reversal of 18168074501 is 10547086181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16725214276 + 1442860225 = 129326^2 + 37985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18168074501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18168074581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084037250 + 9084037251.

It is an arithmetic number, because the mean of its divisors is an integer number (9084037251).

Almost surely, 2^18168074501 is an apocalyptic number.

It is an amenable number.

18168074501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168074501 is an equidigital number, since it uses as much as digits as its factorization.

18168074501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 18168074501 in words is "eighteen billion, one hundred sixty-eight million, seventy-four thousand, five hundred one".