190086661 has 2 divisors, whose sum is σ = 190086662. Its totient is φ = 190086660.

The previous prime is 190086653. The next prime is 190086713. The reversal of 190086661 is 166680091.

190086661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169156036 + 20930625 = 13006^2 + 4575^2 .

It is a cyclic number.

It is not a de Polignac number, because 190086661 - 2³ = 190086653 is a prime.

It is a super-2 number, since 2×190086661² = 72265877380257842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 190086661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190086161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95043330 + 95043331.

It is an arithmetic number, because the mean of its divisors is an integer number (95043331).

Almost surely, 2^190086661 is an apocalyptic number.

It is an amenable number.

190086661 is a deficient number, since it is larger than the sum of its proper divisors (1).

190086661 is an equidigital number, since it uses as much as digits as its factorization.

190086661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 190086661 is about 13787.1919185888. The cubic root of 190086661 is about 574.9770990249.

The spelling of 190086661 in words is "one hundred ninety million, eighty-six thousand, six hundred sixty-one".