17664869381 has 2 divisors, whose sum is σ = 17664869382. Its totient is φ = 17664869380.

The previous prime is 17664869351. The next prime is 17664869399. The reversal of 17664869381 is 18396846671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11202317281 + 6462552100 = 105841^2 + 80390^2 .

It is a cyclic number.

It is not a de Polignac number, because 17664869381 - 2¹⁰ = 17664868357 is a prime.

It is a super-2 number, since 2×17664869381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 17664869381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17664869351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8832434690 + 8832434691.

It is an arithmetic number, because the mean of its divisors is an integer number (8832434691).

Almost surely, 2^17664869381 is an apocalyptic number.

It is an amenable number.

17664869381 is a deficient number, since it is larger than the sum of its proper divisors (1).

17664869381 is an equidigital number, since it uses as much as digits as its factorization.

17664869381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 59.

The spelling of 17664869381 in words is "seventeen billion, six hundred sixty-four million, eight hundred sixty-nine thousand, three hundred eighty-one".