188391385255 has 4 divisors (see below), whose sum is σ = 226069662312. Its totient is φ = 150713108200.

The previous prime is 188391385249. The next prime is 188391385261. The reversal of 188391385255 is 552583193881.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (188391385249) and next prime (188391385261).

It is a de Polignac number, because none of the positive numbers 2^k-188391385255 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188391385255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18839138521 + ... + 18839138530.

It is an arithmetic number, because the mean of its divisors is an integer number (56517415578).

Almost surely, 2^188391385255 is an apocalyptic number.

188391385255 is a deficient number, since it is larger than the sum of its proper divisors (37678277057).

188391385255 is an equidigital number, since it uses as much as digits as its factorization.

188391385255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37678277056.

The product of its digits is 10368000, while the sum is 58.

The spelling of 188391385255 in words is "one hundred eighty-eight billion, three hundred ninety-one million, three hundred eighty-five thousand, two hundred fifty-five".