667657407 has 8 divisors (see below), whose sum is σ = 911922480. Its totient is φ = 434248640.

The previous prime is 667657399. The next prime is 667657411. The reversal of 667657407 is 704756766.

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

It is a cyclic number.

It is not a de Polignac number, because 667657407 - 2³ = 667657399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667657457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2713932 + ... + 2714177.

It is an arithmetic number, because the mean of its divisors is an integer number (113990310).

Almost surely, 2^667657407 is an apocalyptic number.

667657407 is a deficient number, since it is larger than the sum of its proper divisors (244265073).

667657407 is a wasteful number, since it uses less digits than its factorization.

667657407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428153.

The product of its (nonzero) digits is 1481760, while the sum is 48.

The square root of 667657407 is about 25839.0674560829. The cubic root of 667657407 is about 874.0129962442.

The spelling of 667657407 in words is "six hundred sixty-seven million, six hundred fifty-seven thousand, four hundred seven".