11668403621 has 4 divisors (see below), whose sum is σ = 13335318432. Its totient is φ = 10001488812.

The previous prime is 11668403599. The next prime is 11668403639. The reversal of 11668403621 is 12630486611.

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: 12630486611 = 37 ⋅341364503.

It is a de Polignac number, because none of the positive numbers 2^k-11668403621 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 (11668403221) 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, 833457395 + ... + 833457408.

It is an arithmetic number, because the mean of its divisors is an integer number (3333829608).

Almost surely, 2^11668403621 is an apocalyptic number.

It is an amenable number.

11668403621 is a deficient number, since it is larger than the sum of its proper divisors (1666914811).

11668403621 is an equidigital number, since it uses as much as digits as its factorization.

11668403621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666914810.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 11668403621 in words is "eleven billion, six hundred sixty-eight million, four hundred three thousand, six hundred twenty-one".