667137706 has 8 divisors (see below), whose sum is σ = 1002466980. Its totient is φ = 332982048.

The previous prime is 667137631. The next prime is 667137719. The reversal of 667137706 is 607731766.

It can be written as a sum of positive squares in 2 ways, for example, as 585398025 + 81739681 = 24195^2 + 9041^2 .

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

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, 291981 + ... + 294256.

Almost surely, 2^667137706 is an apocalyptic number.

667137706 is a deficient number, since it is larger than the sum of its proper divisors (335329274).

667137706 is a wasteful number, since it uses less digits than its factorization.

667137706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586808.

The product of its (nonzero) digits is 222264, while the sum is 43.

The square root of 667137706 is about 25829.0090015084. The cubic root of 667137706 is about 873.7861616781.

The spelling of 667137706 in words is "six hundred sixty-seven million, one hundred thirty-seven thousand, seven hundred six".