667996660 has 24 divisors (see below), whose sum is σ = 1411200000. Its totient is φ = 265597344.

The previous prime is 667996621. The next prime is 667996663. The reversal of 667996660 is 66699766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667996663) 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, 96660 + ... + 103339.

It is an arithmetic number, because the mean of its divisors is an integer number (58800000).

Almost surely, 2^667996660 is an apocalyptic number.

It is an amenable number.

667996660 is an abundant number, since it is smaller than the sum of its proper divisors (743203340).

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

667996660 is a wasteful number, since it uses less digits than its factorization.

667996660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200175 (or 200173 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 55.

The square root of 667996660 is about 25845.6313523195. The cubic root of 667996660 is about 874.1610069458.

The spelling of 667996660 in words is "six hundred sixty-seven million, nine hundred ninety-six thousand, six hundred sixty".