13660326505 has 16 divisors (see below), whose sum is σ = 18736058880. Its totient is φ = 9366132672.

The previous prime is 13660326499. The next prime is 13660326509. The reversal of 13660326505 is 50562306631.

It is a cyclic number.

It is not a de Polignac number, because 13660326505 - 2⁷ = 13660326377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13660326509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671392 + ... + 691438.

It is an arithmetic number, because the mean of its divisors is an integer number (1171003680).

Almost surely, 2^13660326505 is an apocalyptic number.

It is an amenable number.

13660326505 is a deficient number, since it is larger than the sum of its proper divisors (5075732375).

13660326505 is a wasteful number, since it uses less digits than its factorization.

13660326505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39528.

The product of its (nonzero) digits is 97200, while the sum is 37.

The spelling of 13660326505 in words is "thirteen billion, six hundred sixty million, three hundred twenty-six thousand, five hundred five".