667403663 has 8 divisors (see below), whose sum is σ = 711001008. Its totient is φ = 624288384.

The previous prime is 667403647. The next prime is 667403677. The reversal of 667403663 is 366304766.

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 667403663 - 2⁴ = 667403647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667403663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667403603) 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, 117656 + ... + 123197.

It is an arithmetic number, because the mean of its divisors is an integer number (88875126).

Almost surely, 2^667403663 is an apocalyptic number.

667403663 is a deficient number, since it is larger than the sum of its proper divisors (43597345).

667403663 is a wasteful number, since it uses less digits than its factorization.

667403663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241033.

The product of its (nonzero) digits is 326592, while the sum is 41.

The square root of 667403663 is about 25834.1569051518. The cubic root of 667403663 is about 873.9022589845.

The spelling of 667403663 in words is "six hundred sixty-seven million, four hundred three thousand, six hundred sixty-three".