667605056 has 28 divisors (see below), whose sum is σ = 1370464620. Its totient is φ = 322291200.

The previous prime is 667605047. The next prime is 667605067. The reversal of 667605056 is 650506766.

It can be written as a sum of positive squares in 2 ways, for example, as 551310400 + 116294656 = 23480^2 + 10784^2 .

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, 177995 + ... + 181706.

It is an arithmetic number, because the mean of its divisors is an integer number (48945165).

Almost surely, 2^667605056 is an apocalyptic number.

It is an amenable number.

667605056 is an abundant number, since it is smaller than the sum of its proper divisors (702859564).

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

667605056 is a wasteful number, since it uses less digits than its factorization.

667605056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359742 (or 359732 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 667605056 is about 25838.0544159192. The cubic root of 667605056 is about 873.9901518683.

The spelling of 667605056 in words is "six hundred sixty-seven million, six hundred five thousand, fifty-six".