13261326566 has 8 divisors (see below), whose sum is σ = 19893235824. Its totient is φ = 6630247960.

The previous prime is 13261326523. The next prime is 13261326571. The reversal of 13261326566 is 66562316231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166085 + ... + 232608.

It is an arithmetic number, because the mean of its divisors is an integer number (2486654478).

Almost surely, 2^13261326566 is an apocalyptic number.

13261326566 is a deficient number, since it is larger than the sum of its proper divisors (6631909258).

13261326566 is a wasteful number, since it uses less digits than its factorization.

13261326566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415326.

The product of its digits is 233280, while the sum is 41.

The spelling of 13261326566 in words is "thirteen billion, two hundred sixty-one million, three hundred twenty-six thousand, five hundred sixty-six".