17918758987 has 2 divisors, whose sum is σ = 17918758988. Its totient is φ = 17918758986.

The previous prime is 17918758981. The next prime is 17918759041. The reversal of 17918758987 is 78985781971.

It is a weak prime.

It is an emirp because it is prime and its reverse (78985781971) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17918758987 is a prime.

It is not a weakly prime, because it can be changed into another prime (17918758981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8959379493 + 8959379494.

It is an arithmetic number, because the mean of its divisors is an integer number (8959379494).

Almost surely, 2^17918758987 is an apocalyptic number.

17918758987 is a deficient number, since it is larger than the sum of its proper divisors (1).

17918758987 is an equidigital number, since it uses as much as digits as its factorization.

17918758987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71124480, while the sum is 70.

The spelling of 17918758987 in words is "seventeen billion, nine hundred eighteen million, seven hundred fifty-eight thousand, nine hundred eighty-seven".