130666661 has 2 divisors, whose sum is σ = 130666662. Its totient is φ = 130666660.

The previous prime is 130666621. The next prime is 130666673. The reversal of 130666661 is 166666031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106213636 + 24453025 = 10306^2 + 4945^2 .

It is a cyclic number.

It is not a de Polignac number, because 130666661 - 2¹⁰ = 130665637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130666621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65333330 + 65333331.

It is an arithmetic number, because the mean of its divisors is an integer number (65333331).

Almost surely, 2^130666661 is an apocalyptic number.

It is an amenable number.

130666661 is a deficient number, since it is larger than the sum of its proper divisors (1).

130666661 is an equidigital number, since it uses as much as digits as its factorization.

130666661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 130666661 is about 11430.9518851231. The cubic root of 130666661 is about 507.4441667325. Note that the first 3 decimals are identical.

The spelling of 130666661 in words is "one hundred thirty million, six hundred sixty-six thousand, six hundred sixty-one".