667049767 has 4 divisors (see below), whose sum is σ = 670905720. Its totient is φ = 663193816.

The previous prime is 667049759. The next prime is 667049839. The reversal of 667049767 is 767940766.

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

It is a cyclic number.

It is not a de Polignac number, because 667049767 - 2³ = 667049759 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 (667049707) by changing a digit.

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, 1927717 + ... + 1928062.

It is an arithmetic number, because the mean of its divisors is an integer number (167726430).

Almost surely, 2^667049767 is an apocalyptic number.

667049767 is a deficient number, since it is larger than the sum of its proper divisors (3855953).

667049767 is a wasteful number, since it uses less digits than its factorization.

667049767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855952.

The product of its (nonzero) digits is 2667168, while the sum is 52.

The square root of 667049767 is about 25827.3066152861. The cubic root of 667049767 is about 873.7477671772.

The spelling of 667049767 in words is "six hundred sixty-seven million, forty-nine thousand, seven hundred sixty-seven".