731666657 has 2 divisors, whose sum is σ = 731666658. Its totient is φ = 731666656.

The previous prime is 731666569. The next prime is 731666659. The reversal of 731666657 is 756666137.

731666657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591267856 + 140398801 = 24316^2 + 11849^2 .

It is a cyclic number.

It is not a de Polignac number, because 731666657 - 2⁸ = 731666401 is a prime.

Together with 731666659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (731666659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365833328 + 365833329.

It is an arithmetic number, because the mean of its divisors is an integer number (365833329).

Almost surely, 2^731666657 is an apocalyptic number.

It is an amenable number.

731666657 is a deficient number, since it is larger than the sum of its proper divisors (1).

731666657 is an equidigital number, since it uses as much as digits as its factorization.

731666657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 47.

The square root of 731666657 is about 27049.3374595386. The cubic root of 731666657 is about 901.0960543532.

The spelling of 731666657 in words is "seven hundred thirty-one million, six hundred sixty-six thousand, six hundred fifty-seven".