188431442287 has 6 divisors (see below), whose sum is σ = 207118858184. Its totient is φ = 171301311060.

The previous prime is 188431442273. The next prime is 188431442299. The reversal of 188431442287 is 782244134881.

It is not a de Polignac number, because 188431442287 - 2³¹ = 186283958639 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 (188431442237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 778642203 + ... + 778642444.

Almost surely, 2^188431442287 is an apocalyptic number.

188431442287 is a deficient number, since it is larger than the sum of its proper divisors (18687415897).

188431442287 is a wasteful number, since it uses less digits than its factorization.

188431442287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557284669 (or 1557284658 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 52.

The spelling of 188431442287 in words is "one hundred eighty-eight billion, four hundred thirty-one million, four hundred forty-two thousand, two hundred eighty-seven".