633366661 has 2 divisors, whose sum is σ = 633366662. Its totient is φ = 633366660.

The previous prime is 633366581. The next prime is 633366677. The reversal of 633366661 is 166663336.

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., 630964161 + 2402500 = 25119^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 633366661 - 2⁷ = 633366533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633366361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316683330 + 316683331.

It is an arithmetic number, because the mean of its divisors is an integer number (316683331).

Almost surely, 2^633366661 is an apocalyptic number.

It is an amenable number.

633366661 is a deficient number, since it is larger than the sum of its proper divisors (1).

633366661 is an equidigital number, since it uses as much as digits as its factorization.

633366661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 40.

The square root of 633366661 is about 25166.7769291183. The cubic root of 633366661 is about 858.7862185702.

The spelling of 633366661 in words is "six hundred thirty-three million, three hundred sixty-six thousand, six hundred sixty-one".