17985738907 has 2 divisors, whose sum is σ = 17985738908. Its totient is φ = 17985738906.

The previous prime is 17985738889. The next prime is 17985738949. The reversal of 17985738907 is 70983758971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17985738907 - 2⁷ = 17985738779 is a prime.

It is not a weakly prime, because it can be changed into another prime (17985738107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8992869453 + 8992869454.

It is an arithmetic number, because the mean of its divisors is an integer number (8992869454).

Almost surely, 2^17985738907 is an apocalyptic number.

17985738907 is a deficient number, since it is larger than the sum of its proper divisors (1).

17985738907 is an equidigital number, since it uses as much as digits as its factorization.

17985738907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 17985738907 in words is "seventeen billion, nine hundred eighty-five million, seven hundred thirty-eight thousand, nine hundred seven".