163786661 has 2 divisors, whose sum is σ = 163786662. Its totient is φ = 163786660.

The previous prime is 163786627. The next prime is 163786673. The reversal of 163786661 is 166687361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106481761 + 57304900 = 10319^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 163786661 - 2²² = 159592357 is a prime.

It is a Chen prime.

It is equal to p_9174869 and since 163786661 and 9174869 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163786621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81893330 + 81893331.

It is an arithmetic number, because the mean of its divisors is an integer number (81893331).

Almost surely, 2^163786661 is an apocalyptic number.

It is an amenable number.

163786661 is a deficient number, since it is larger than the sum of its proper divisors (1).

163786661 is an equidigital number, since it uses as much as digits as its factorization.

163786661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 163786661 is about 12797.9162757068. The cubic root of 163786661 is about 547.1329160182.

The spelling of 163786661 in words is "one hundred sixty-three million, seven hundred eighty-six thousand, six hundred sixty-one".