661673333 has 2 divisors, whose sum is σ = 661673334. Its totient is φ = 661673332.

The previous prime is 661673317. The next prime is 661673351. The reversal of 661673333 is 333376166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 343657444 + 318015889 = 18538^2 + 17833^2 .

It is a cyclic number.

It is not a de Polignac number, because 661673333 - 2⁴ = 661673317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661673833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330836666 + 330836667.

It is an arithmetic number, because the mean of its divisors is an integer number (330836667).

Almost surely, 2^661673333 is an apocalyptic number.

It is an amenable number.

661673333 is a deficient number, since it is larger than the sum of its proper divisors (1).

661673333 is an equidigital number, since it uses as much as digits as its factorization.

661673333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 38.

The square root of 661673333 is about 25723.0117404631. The cubic root of 661673333 is about 871.3939572627.

The spelling of 661673333 in words is "six hundred sixty-one million, six hundred seventy-three thousand, three hundred thirty-three".