1040866661 has 2 divisors, whose sum is σ = 1040866662. Its totient is φ = 1040866660.

The previous prime is 1040866609. The next prime is 1040866663. The reversal of 1040866661 is 1666680401.

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., 1040385025 + 481636 = 32255^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040866661 - 2¹⁴ = 1040850277 is a prime.

Together with 1040866663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040866663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520433330 + 520433331.

It is an arithmetic number, because the mean of its divisors is an integer number (520433331).

Almost surely, 2^1040866661 is an apocalyptic number.

It is an amenable number.

1040866661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040866661 is an equidigital number, since it uses as much as digits as its factorization.

1040866661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1040866661 is about 32262.4652033908. The cubic root of 1040866661 is about 1013.4407570091.

The spelling of 1040866661 in words is "one billion, forty million, eight hundred sixty-six thousand, six hundred sixty-one".