18880433317 has 2 divisors, whose sum is σ = 18880433318. Its totient is φ = 18880433316.

The previous prime is 18880433287. The next prime is 18880433357. The reversal of 18880433317 is 71333408881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13943122561 + 4937310756 = 118081^2 + 70266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18880433317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18880433357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440216658 + 9440216659.

It is an arithmetic number, because the mean of its divisors is an integer number (9440216659).

Almost surely, 2^18880433317 is an apocalyptic number.

It is an amenable number.

18880433317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18880433317 is an equidigital number, since it uses as much as digits as its factorization.

18880433317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 18880433317 in words is "eighteen billion, eight hundred eighty million, four hundred thirty-three thousand, three hundred seventeen".