673656649 has 2 divisors, whose sum is σ = 673656650. Its totient is φ = 673656648.

The previous prime is 673656601. The next prime is 673656667. The reversal of 673656649 is 946656376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648975625 + 24681024 = 25475^2 + 4968^2 .

It is a cyclic number.

It is not a de Polignac number, because 673656649 - 2¹³ = 673648457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 673656596 and 673656605.

It is not a weakly prime, because it can be changed into another prime (673696649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336828324 + 336828325.

It is an arithmetic number, because the mean of its divisors is an integer number (336828325).

Almost surely, 2^673656649 is an apocalyptic number.

It is an amenable number.

673656649 is a deficient number, since it is larger than the sum of its proper divisors (1).

673656649 is an equidigital number, since it uses as much as digits as its factorization.

673656649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 52.

The square root of 673656649 is about 25954.8964359329. The cubic root of 673656649 is about 876.6230117165.

The spelling of 673656649 in words is "six hundred seventy-three million, six hundred fifty-six thousand, six hundred forty-nine".