667289261 has 8 divisors (see below), whose sum is σ = 672215544. Its totient is φ = 662376960.

The previous prime is 667289209. The next prime is 667289269. The reversal of 667289261 is 162982766.

667289261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 35772361 + 631516900 = 5981^2 + 25130^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667289261 is a prime.

It is a super-2 number, since 2×667289261² = 890549915691852242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667289269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104225 + ... + 110441.

It is an arithmetic number, because the mean of its divisors is an integer number (84026943).

Almost surely, 2^667289261 is an apocalyptic number.

It is an amenable number.

667289261 is a deficient number, since it is larger than the sum of its proper divisors (4926283).

667289261 is a wasteful number, since it uses less digits than its factorization.

667289261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6991.

The product of its digits is 435456, while the sum is 47.

The square root of 667289261 is about 25831.9426485892. The cubic root of 667289261 is about 873.8523232486.

The spelling of 667289261 in words is "six hundred sixty-seven million, two hundred eighty-nine thousand, two hundred sixty-one".