6243616661 has 2 divisors, whose sum is σ = 6243616662. Its totient is φ = 6243616660.

The previous prime is 6243616637. The next prime is 6243616669. The reversal of 6243616661 is 1666163426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5746549636 + 497067025 = 75806^2 + 22295^2 .

It is a cyclic number.

It is not a de Polignac number, because 6243616661 - 2¹⁴ = 6243600277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6243616669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3121808330 + 3121808331.

It is an arithmetic number, because the mean of its divisors is an integer number (3121808331).

Almost surely, 2^6243616661 is an apocalyptic number.

It is an amenable number.

6243616661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6243616661 is an equidigital number, since it uses as much as digits as its factorization.

6243616661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 6243616661 is about 79016.5594100376. The cubic root of 6243616661 is about 1841.3884311194.

It can be divided in two parts, 62436 and 16661, that added together give a palindrome (79097).

The spelling of 6243616661 in words is "six billion, two hundred forty-three million, six hundred sixteen thousand, six hundred sixty-one".