667699212 has 24 divisors (see below), whose sum is σ = 1563048256. Its totient is φ = 221840208.

The previous prime is 667699189. The next prime is 667699213. The reversal of 667699212 is 212996766.

It is not an unprimeable number, because it can be changed into a prime (667699213) 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, 86938 + ... + 94305.

Almost surely, 2^667699212 is an apocalyptic number.

It is an amenable number.

667699212 is an abundant number, since it is smaller than the sum of its proper divisors (895349044).

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

667699212 is a wasteful number, since it uses less digits than its factorization.

667699212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181557 (or 181555 counting only the distinct ones).

The product of its digits is 489888, while the sum is 48.

The square root of 667699212 is about 25839.8763928932. The cubic root of 667699212 is about 874.0312378106.

The spelling of 667699212 in words is "six hundred sixty-seven million, six hundred ninety-nine thousand, two hundred twelve".