667746733 has 4 divisors (see below), whose sum is σ = 685793980. Its totient is φ = 649699488.

The previous prime is 667746691. The next prime is 667746749. The reversal of 667746733 is 337647766.

667746733 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318729609 + 349017124 = 17853^2 + 18682^2 .

It is a cyclic number.

It is not a de Polignac number, because 667746733 - 2⁹ = 667746221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667786733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9023568 + ... + 9023641.

It is an arithmetic number, because the mean of its divisors is an integer number (171448495).

Almost surely, 2^667746733 is an apocalyptic number.

It is an amenable number.

667746733 is a deficient number, since it is larger than the sum of its proper divisors (18047247).

667746733 is a wasteful number, since it uses less digits than its factorization.

667746733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18047246.

The product of its digits is 2667168, while the sum is 49.

The square root of 667746733 is about 25840.7959049252. The cubic root of 667746733 is about 874.0519726227.

The spelling of 667746733 in words is "six hundred sixty-seven million, seven hundred forty-six thousand, seven hundred thirty-three".