6641531693 has 2 divisors, whose sum is σ = 6641531694. Its totient is φ = 6641531692.

The previous prime is 6641531641. The next prime is 6641531759. The reversal of 6641531693 is 3961351466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3986912164 + 2654619529 = 63142^2 + 51523^2 .

It is a cyclic number.

It is not a de Polignac number, because 6641531693 - 2¹⁸ = 6641269549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6641581693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320765846 + 3320765847.

It is an arithmetic number, because the mean of its divisors is an integer number (3320765847).

Almost surely, 2^6641531693 is an apocalyptic number.

It is an amenable number.

6641531693 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641531693 is an equidigital number, since it uses as much as digits as its factorization.

6641531693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 6641531693 is about 81495.5930894426. The cubic root of 6641531693 is about 1879.7037873624.

The spelling of 6641531693 in words is "six billion, six hundred forty-one million, five hundred thirty-one thousand, six hundred ninety-three".