673369561 has 2 divisors, whose sum is σ = 673369562. Its totient is φ = 673369560.

The previous prime is 673369559. The next prime is 673369577. The reversal of 673369561 is 165963376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605406025 + 67963536 = 24605^2 + 8244^2 .

It is a cyclic number.

It is not a de Polignac number, because 673369561 - 2¹ = 673369559 is a prime.

Together with 673369559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (673369261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336684780 + 336684781.

It is an arithmetic number, because the mean of its divisors is an integer number (336684781).

Almost surely, 2^673369561 is an apocalyptic number.

It is an amenable number.

673369561 is a deficient number, since it is larger than the sum of its proper divisors (1).

673369561 is an equidigital number, since it uses as much as digits as its factorization.

673369561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 46.

The square root of 673369561 is about 25949.3653294257. The cubic root of 673369561 is about 876.4984657248.

The spelling of 673369561 in words is "six hundred seventy-three million, three hundred sixty-nine thousand, five hundred sixty-one".