13660326509 has 2 divisors, whose sum is σ = 13660326510. Its totient is φ = 13660326508.

The previous prime is 13660326499. The next prime is 13660326517. The reversal of 13660326509 is 90562306631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12969793225 + 690533284 = 113885^2 + 26278^2 .

It is a cyclic number.

It is not a de Polignac number, because 13660326509 - 2¹² = 13660322413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13660326569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830163254 + 6830163255.

It is an arithmetic number, because the mean of its divisors is an integer number (6830163255).

Almost surely, 2^13660326509 is an apocalyptic number.

It is an amenable number.

13660326509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13660326509 is an equidigital number, since it uses as much as digits as its factorization.

13660326509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 41.

The spelling of 13660326509 in words is "thirteen billion, six hundred sixty million, three hundred twenty-six thousand, five hundred nine".