190680661 has 2 divisors, whose sum is σ = 190680662. Its totient is φ = 190680660.

The previous prime is 190680629. The next prime is 190680667. The reversal of 190680661 is 166086091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176730436 + 13950225 = 13294^2 + 3735^2 .

It is an emirp because it is prime and its reverse (166086091) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 199089061 and 160980991.

It is a cyclic number.

It is not a de Polignac number, because 190680661 - 2⁵ = 190680629 is a prime.

It is a super-2 number, since 2×190680661² = 72718228958793842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190680661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190680667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95340330 + 95340331.

It is an arithmetic number, because the mean of its divisors is an integer number (95340331).

Almost surely, 2^190680661 is an apocalyptic number.

It is an amenable number.

190680661 is a deficient number, since it is larger than the sum of its proper divisors (1).

190680661 is an equidigital number, since it uses as much as digits as its factorization.

190680661 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 190680661 is about 13808.7168484259. The cubic root of 190680661 is about 575.5753897497.

The spelling of 190680661 in words is "one hundred ninety million, six hundred eighty thousand, six hundred sixty-one".