13664261261 has 16 divisors (see below), whose sum is σ = 15961989120. Its totient is φ = 11453376240.

The previous prime is 13664261243. The next prime is 13664261297. The reversal of 13664261261 is 16216246631.

It is a cyclic number.

It is not a de Polignac number, because 13664261261 - 2¹⁸ = 13663999117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664261201) 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, 388130 + ... + 421868.

It is an arithmetic number, because the mean of its divisors is an integer number (997624320).

Almost surely, 2^13664261261 is an apocalyptic number.

It is an amenable number.

13664261261 is a deficient number, since it is larger than the sum of its proper divisors (2297727859).

13664261261 is a wasteful number, since it uses less digits than its factorization.

13664261261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35024.

The product of its digits is 62208, while the sum is 38.

The spelling of 13664261261 in words is "thirteen billion, six hundred sixty-four million, two hundred sixty-one thousand, two hundred sixty-one".