188551789081 has 2 divisors, whose sum is σ = 188551789082. Its totient is φ = 188551789080.

The previous prime is 188551789057. The next prime is 188551789091. The reversal of 188551789081 is 180987155881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186239718025 + 2312071056 = 431555^2 + 48084^2 .

It is a cyclic number.

It is not a de Polignac number, because 188551789081 - 2¹⁵ = 188551756313 is a prime.

It is a super-2 number, since 2×188551789081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188551789001) 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 as a sum of consecutive naturals, namely, 94275894540 + 94275894541.

It is an arithmetic number, because the mean of its divisors is an integer number (94275894541).

Almost surely, 2^188551789081 is an apocalyptic number.

It is an amenable number.

188551789081 is a deficient number, since it is larger than the sum of its proper divisors (1).

188551789081 is an equidigital number, since it uses as much as digits as its factorization.

188551789081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6451200, while the sum is 61.

The spelling of 188551789081 in words is "one hundred eighty-eight billion, five hundred fifty-one million, seven hundred eighty-nine thousand, eighty-one".