667660416 has 32 divisors (see below), whose sum is σ = 1773474000. Its totient is φ = 222553344.

The previous prime is 667660403. The next prime is 667660429. The reversal of 667660416 is 614066766.

It is an interprime number because it is at equal distance from previous prime (667660403) and next prime (667660429).

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868966 + ... + 869733.

Almost surely, 2^667660416 is an apocalyptic number.

It is an amenable number.

667660416 is an abundant number, since it is smaller than the sum of its proper divisors (1105813584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667660416 is a wasteful number, since it uses less digits than its factorization.

667660416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738716 (or 1738704 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 667660416 is about 25839.1256818028. The cubic root of 667660416 is about 874.0143092435.

The spelling of 667660416 in words is "six hundred sixty-seven million, six hundred sixty thousand, four hundred sixteen".