667296689 has 4 divisors (see below), whose sum is σ = 683572260. Its totient is φ = 651021120.

The previous prime is 667296683. The next prime is 667296697. The reversal of 667296689 is 986692766.

667296689 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 213393664 + 453903025 = 14608^2 + 21305^2 .

It is a cyclic number.

It is not a de Polignac number, because 667296689 - 2⁴ = 667296673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667296683) 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, 8137724 + ... + 8137805.

It is an arithmetic number, because the mean of its divisors is an integer number (170893065).

Almost surely, 2^667296689 is an apocalyptic number.

It is an amenable number.

667296689 is a deficient number, since it is larger than the sum of its proper divisors (16275571).

667296689 is a wasteful number, since it uses less digits than its factorization.

667296689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16275570.

The product of its digits is 11757312, while the sum is 59.

The square root of 667296689 is about 25832.0864236709. The cubic root of 667296689 is about 873.8555656960.

The spelling of 667296689 in words is "six hundred sixty-seven million, two hundred ninety-six thousand, six hundred eighty-nine".