11623669661 has 4 divisors (see below), whose sum is σ = 11770804800. Its totient is φ = 11476534524.

The previous prime is 11623669579. The next prime is 11623669703. The reversal of 11623669661 is 16696632611.

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: 16696632611 = 7517 ⋅2221183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11623669661 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 (11623669361) 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, 73567451 + ... + 73567608.

It is an arithmetic number, because the mean of its divisors is an integer number (2942701200).

Almost surely, 2^11623669661 is an apocalyptic number.

It is an amenable number.

11623669661 is a deficient number, since it is larger than the sum of its proper divisors (147135139).

11623669661 is an equidigital number, since it uses as much as digits as its factorization.

11623669661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147135138.

The product of its digits is 419904, while the sum is 47.

The spelling of 11623669661 in words is "eleven billion, six hundred twenty-three million, six hundred sixty-nine thousand, six hundred sixty-one".