188443961969 has 4 divisors (see below), whose sum is σ = 188514516480. Its totient is φ = 188373407460.

The previous prime is 188443961891. The next prime is 188443961989. The reversal of 188443961969 is 969169344881.

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: 969169344881 = 26021 ⋅37245661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188443961969 is a prime.

It is a super-2 number, since 2×188443961969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 188443961899 and 188443961908.

It is not an unprimeable number, because it can be changed into a prime (188443961989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35273249 + ... + 35278590.

It is an arithmetic number, because the mean of its divisors is an integer number (47128629120).

Almost surely, 2^188443961969 is an apocalyptic number.

It is an amenable number.

188443961969 is a deficient number, since it is larger than the sum of its proper divisors (70554511).

188443961969 is an equidigital number, since it uses as much as digits as its factorization.

188443961969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70554510.

The product of its digits is 80621568, while the sum is 68.

The spelling of 188443961969 in words is "one hundred eighty-eight billion, four hundred forty-three million, nine hundred sixty-one thousand, nine hundred sixty-nine".