13636646461 has 4 divisors (see below), whose sum is σ = 13637775424. Its totient is φ = 13635517500.

The previous prime is 13636646449. The next prime is 13636646533. The reversal of 13636646461 is 16464663631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16464663631 = 13 ⋅1266512587.

It is a cyclic number.

It is not a de Polignac number, because 13636646461 - 2¹³ = 13636638269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13636946461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546165 + ... + 570586.

It is an arithmetic number, because the mean of its divisors is an integer number (3409443856).

Almost surely, 2^13636646461 is an apocalyptic number.

It is an amenable number.

13636646461 is a deficient number, since it is larger than the sum of its proper divisors (1128963).

13636646461 is a wasteful number, since it uses less digits than its factorization.

13636646461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128962.

The product of its digits is 1119744, while the sum is 46.

The spelling of 13636646461 in words is "thirteen billion, six hundred thirty-six million, six hundred forty-six thousand, four hundred sixty-one".