13521272661 has 12 divisors (see below), whose sum is σ = 21033090988. Its totient is φ = 8320783104.

The previous prime is 13521272641. The next prime is 13521272693. The reversal of 13521272661 is 16627212531.

13521272661 is a `hidden beast` number, since 1 + 3 + 521 + 2 + 72 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8075718225 + 5445554436 = 89865^2 + 73794^2 .

It is not a de Polignac number, because 13521272661 - 2¹³ = 13521264469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521272641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57783100 + ... + 57783333.

Almost surely, 2^13521272661 is an apocalyptic number.

It is an amenable number.

13521272661 is a deficient number, since it is larger than the sum of its proper divisors (7511818327).

13521272661 is a wasteful number, since it uses less digits than its factorization.

13521272661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115566452 (or 115566449 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 13521272661 in words is "thirteen billion, five hundred twenty-one million, two hundred seventy-two thousand, six hundred sixty-one".