17975065981 has 2 divisors, whose sum is σ = 17975065982. Its totient is φ = 17975065980.

The previous prime is 17975065903. The next prime is 17975066069. The reversal of 17975065981 is 18956057971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10906460356 + 7068605625 = 104434^2 + 84075^2 .

It is a cyclic number.

It is not a de Polignac number, because 17975065981 - 2⁹ = 17975065469 is a prime.

It is a super-2 number, since 2×17975065981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17975065081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8987532990 + 8987532991.

It is an arithmetic number, because the mean of its divisors is an integer number (8987532991).

Almost surely, 2^17975065981 is an apocalyptic number.

It is an amenable number.

17975065981 is a deficient number, since it is larger than the sum of its proper divisors (1).

17975065981 is an equidigital number, since it uses as much as digits as its factorization.

17975065981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4762800, while the sum is 58.

The spelling of 17975065981 in words is "seventeen billion, nine hundred seventy-five million, sixty-five thousand, nine hundred eighty-one".