6723450661 has 2 divisors, whose sum is σ = 6723450662. Its totient is φ = 6723450660.

The previous prime is 6723450659. The next prime is 6723450673. The reversal of 6723450661 is 1660543276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6656112225 + 67338436 = 81585^2 + 8206^2 .

It is a cyclic number.

It is not a de Polignac number, because 6723450661 - 2¹ = 6723450659 is a prime.

Together with 6723450659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6723450611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3361725330 + 3361725331.

It is an arithmetic number, because the mean of its divisors is an integer number (3361725331).

Almost surely, 2^6723450661 is an apocalyptic number.

It is an amenable number.

6723450661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6723450661 is an equidigital number, since it uses as much as digits as its factorization.

6723450661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 6723450661 is about 81996.6503035337. The cubic root of 6723450661 is about 1887.4005361151.

The spelling of 6723450661 in words is "six billion, seven hundred twenty-three million, four hundred fifty thousand, six hundred sixty-one".