658673321 has 2 divisors, whose sum is σ = 658673322. Its totient is φ = 658673320.

The previous prime is 658673311. The next prime is 658673329. The reversal of 658673321 is 123376856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368448025 + 290225296 = 19195^2 + 17036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-658673321 is a prime.

It is not a weakly prime, because it can be changed into another prime (658673329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329336660 + 329336661.

It is an arithmetic number, because the mean of its divisors is an integer number (329336661).

Almost surely, 2^658673321 is an apocalyptic number.

It is an amenable number.

658673321 is a deficient number, since it is larger than the sum of its proper divisors (1).

658673321 is an equidigital number, since it uses as much as digits as its factorization.

658673321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 658673321 is about 25664.6317137028. The cubic root of 658673321 is about 870.0750016813.

The spelling of 658673321 in words is "six hundred fifty-eight million, six hundred seventy-three thousand, three hundred twenty-one".