17864938517 has 2 divisors, whose sum is σ = 17864938518. Its totient is φ = 17864938516.

The previous prime is 17864938457. The next prime is 17864938547. The reversal of 17864938517 is 71583946871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10756593796 + 7108344721 = 103714^2 + 84311^2 .

It is a cyclic number.

It is not a de Polignac number, because 17864938517 - 2¹² = 17864934421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17864938547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8932469258 + 8932469259.

It is an arithmetic number, because the mean of its divisors is an integer number (8932469259).

Almost surely, 2^17864938517 is an apocalyptic number.

It is an amenable number.

17864938517 is a deficient number, since it is larger than the sum of its proper divisors (1).

17864938517 is an equidigital number, since it uses as much as digits as its factorization.

17864938517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 59.

The spelling of 17864938517 in words is "seventeen billion, eight hundred sixty-four million, nine hundred thirty-eight thousand, five hundred seventeen".