673663513 has 2 divisors, whose sum is σ = 673663514. Its totient is φ = 673663512.

The previous prime is 673663481. The next prime is 673663531. The reversal of 673663513 is 315366376.

Together with next prime (673663531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639230089 + 34433424 = 25283^2 + 5868^2 .

It is a cyclic number.

It is not a de Polignac number, because 673663513 - 2⁵ = 673663481 is a prime.

It is not a weakly prime, because it can be changed into another prime (673663013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336831756 + 336831757.

It is an arithmetic number, because the mean of its divisors is an integer number (336831757).

Almost surely, 2^673663513 is an apocalyptic number.

It is an amenable number.

673663513 is a deficient number, since it is larger than the sum of its proper divisors (1).

673663513 is an equidigital number, since it uses as much as digits as its factorization.

673663513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 40.

The square root of 673663513 is about 25955.0286649813. The cubic root of 673663513 is about 876.6259890591.

The spelling of 673663513 in words is "six hundred seventy-three million, six hundred sixty-three thousand, five hundred thirteen".