188010661 has 2 divisors, whose sum is σ = 188010662. Its totient is φ = 188010660.

The previous prime is 188010619. The next prime is 188010677. The reversal of 188010661 is 166010881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100120036 + 87890625 = 10006^2 + 9375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188010661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188010611) 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, 94005330 + 94005331.

It is an arithmetic number, because the mean of its divisors is an integer number (94005331).

Almost surely, 2^188010661 is an apocalyptic number.

It is an amenable number.

188010661 is a deficient number, since it is larger than the sum of its proper divisors (1).

188010661 is an equidigital number, since it uses as much as digits as its factorization.

188010661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 188010661 is about 13711.6979619593. The cubic root of 188010661 is about 572.8762599722.

The spelling of 188010661 in words is "one hundred eighty-eight million, ten thousand, six hundred sixty-one".