667408403 has 8 divisors (see below), whose sum is σ = 677505360. Its totient is φ = 657377280.

The previous prime is 667408387. The next prime is 667408429. The reversal of 667408403 is 304804766.

It is a happy number.

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 667408403 - 2⁴ = 667408387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667408433) 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, 4163 + ... + 36771.

It is an arithmetic number, because the mean of its divisors is an integer number (84688170).

Almost surely, 2^667408403 is an apocalyptic number.

667408403 is a deficient number, since it is larger than the sum of its proper divisors (10096957).

667408403 is a wasteful number, since it uses less digits than its factorization.

667408403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32917.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 667408403 is about 25834.2486439997. The cubic root of 667408403 is about 873.9043278409.

The spelling of 667408403 in words is "six hundred sixty-seven million, four hundred eight thousand, four hundred three".