18578096917 has 2 divisors, whose sum is σ = 18578096918. Its totient is φ = 18578096916.

The previous prime is 18578096861. The next prime is 18578096923. The reversal of 18578096917 is 71969087581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16919245476 + 1658851441 = 130074^2 + 40729^2 .

It is an emirp because it is prime and its reverse (71969087581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18578096917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18578096947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9289048458 + 9289048459.

It is an arithmetic number, because the mean of its divisors is an integer number (9289048459).

Almost surely, 2^18578096917 is an apocalyptic number.

It is an amenable number.

18578096917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18578096917 is an equidigital number, since it uses as much as digits as its factorization.

18578096917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 61.

The spelling of 18578096917 in words is "eighteen billion, five hundred seventy-eight million, ninety-six thousand, nine hundred seventeen".