667523705 has 4 divisors (see below), whose sum is σ = 801028452. Its totient is φ = 534018960.

The previous prime is 667523663. The next prime is 667523743. The reversal of 667523705 is 507325766.

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 380289001 + 287234704 = 19501^2 + 16948^2 .

It is not a de Polignac number, because 667523705 - 2⁸ = 667523449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66752366 + ... + 66752375.

It is an arithmetic number, because the mean of its divisors is an integer number (200257113).

Almost surely, 2^667523705 is an apocalyptic number.

It is an amenable number.

667523705 is a deficient number, since it is larger than the sum of its proper divisors (133504747).

667523705 is a wasteful number, since it uses less digits than its factorization.

667523705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133504746.

The product of its (nonzero) digits is 264600, while the sum is 41.

The square root of 667523705 is about 25836.4801201712. The cubic root of 667523705 is about 873.9546504091.

The spelling of 667523705 in words is "six hundred sixty-seven million, five hundred twenty-three thousand, seven hundred five".