661441733 has 2 divisors, whose sum is σ = 661441734. Its totient is φ = 661441732.

The previous prime is 661441723. The next prime is 661441747. The reversal of 661441733 is 337144166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653415844 + 8025889 = 25562^2 + 2833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661441733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661441693 and 661441702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661441723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330720866 + 330720867.

It is an arithmetic number, because the mean of its divisors is an integer number (330720867).

Almost surely, 2^661441733 is an apocalyptic number.

It is an amenable number.

661441733 is a deficient number, since it is larger than the sum of its proper divisors (1).

661441733 is an equidigital number, since it uses as much as digits as its factorization.

661441733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 35.

The square root of 661441733 is about 25718.5095407957. The cubic root of 661441733 is about 871.2922764778.

Adding to 661441733 its reverse (337144166), we get a palindrome (998585899).

The spelling of 661441733 in words is "six hundred sixty-one million, four hundred forty-one thousand, seven hundred thirty-three".