667557680 has 40 divisors (see below), whose sum is σ = 1553163984. Its totient is φ = 266835200.

The previous prime is 667557679. The next prime is 667557701. The reversal of 667557680 is 86755766.

It is a happy number.

667557680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×667557680² = 891266512253964800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191150 + ... + 194610.

Almost surely, 2^667557680 is an apocalyptic number.

It is an amenable number.

667557680 is an abundant number, since it is smaller than the sum of its proper divisors (885606304).

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

667557680 is a wasteful number, since it uses less digits than its factorization.

667557680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5885 (or 5879 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 50.

The square root of 667557680 is about 25837.1376123595. The cubic root of 667557680 is about 873.9694774009.

The spelling of 667557680 in words is "six hundred sixty-seven million, five hundred fifty-seven thousand, six hundred eighty".