6366442661 has 2 divisors, whose sum is σ = 6366442662. Its totient is φ = 6366442660.

The previous prime is 6366442609. The next prime is 6366442673. The reversal of 6366442661 is 1662446636.

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., 4251822436 + 2114620225 = 65206^2 + 45985^2 .

It is a cyclic number.

It is not a de Polignac number, because 6366442661 - 2⁶ = 6366442597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6366442861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3183221330 + 3183221331.

It is an arithmetic number, because the mean of its divisors is an integer number (3183221331).

Almost surely, 2^6366442661 is an apocalyptic number.

It is an amenable number.

6366442661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6366442661 is an equidigital number, since it uses as much as digits as its factorization.

6366442661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 44.

The square root of 6366442661 is about 79789.9909825788. The cubic root of 6366442661 is about 1853.3848584746.

The spelling of 6366442661 in words is "six billion, three hundred sixty-six million, four hundred forty-two thousand, six hundred sixty-one".