188663674421 has 4 divisors (see below), whose sum is σ = 191320909344. Its totient is φ = 186006439500.

The previous prime is 188663674403. The next prime is 188663674471. The reversal of 188663674421 is 124476366881.

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: 124476366881 = 106261 ⋅1171421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188663674421 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 (188663674471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328617355 + ... + 1328617496.

It is an arithmetic number, because the mean of its divisors is an integer number (47830227336).

Almost surely, 2^188663674421 is an apocalyptic number.

It is an amenable number.

188663674421 is a deficient number, since it is larger than the sum of its proper divisors (2657234923).

188663674421 is an equidigital number, since it uses as much as digits as its factorization.

188663674421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657234922.

The product of its digits is 9289728, while the sum is 56.

The spelling of 188663674421 in words is "one hundred eighty-eight billion, six hundred sixty-three million, six hundred seventy-four thousand, four hundred twenty-one".