188866057 has 2 divisors, whose sum is σ = 188866058. Its totient is φ = 188866056.

The previous prime is 188866033. The next prime is 188866063. The reversal of 188866057 is 750668881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122345721 + 66520336 = 11061^2 + 8156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188866057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188866057.

It is not a weakly prime, because it can be changed into another prime (188866757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94433028 + 94433029.

It is an arithmetic number, because the mean of its divisors is an integer number (94433029).

Almost surely, 2^188866057 is an apocalyptic number.

It is an amenable number.

188866057 is a deficient number, since it is larger than the sum of its proper divisors (1).

188866057 is an equidigital number, since it uses as much as digits as its factorization.

188866057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 188866057 is about 13742.8547616571. The cubic root of 188866057 is about 573.7437546766.

The spelling of 188866057 in words is "one hundred eighty-eight million, eight hundred sixty-six thousand, fifty-seven".