188189252789 has 4 divisors (see below), whose sum is σ = 188190155820. Its totient is φ = 188188349760.

The previous prime is 188189252773. The next prime is 188189252803. The reversal of 188189252789 is 987252981881.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 987252981881 = 1259 ⋅784156459.

It can be written as a sum of positive squares in 2 ways, for example, as 11797652689 + 176391600100 = 108617^2 + 419990^2 .

It is a cyclic number.

It is not a de Polignac number, because 188189252789 - 2⁴ = 188189252773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188189252749) 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, 37949 + ... + 614669.

It is an arithmetic number, because the mean of its divisors is an integer number (47047538955).

Almost surely, 2^188189252789 is an apocalyptic number.

It is an amenable number.

188189252789 is a deficient number, since it is larger than the sum of its proper divisors (903031).

188189252789 is an equidigital number, since it uses as much as digits as its factorization.

188189252789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903030.

The product of its digits is 46448640, while the sum is 68.

The spelling of 188189252789 in words is "one hundred eighty-eight billion, one hundred eighty-nine million, two hundred fifty-two thousand, seven hundred eighty-nine".