667666733772 has 12 divisors (see below), whose sum is σ = 1557889045496. Its totient is φ = 222555577920.

The previous prime is 667666733711. The next prime is 667666733807. The reversal of 667666733772 is 277337666766.

667666733772 is digitally balanced in base 2 and base 4, because in such bases 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 (12).

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27819447229 + ... + 27819447252.

Almost surely, 2^667666733772 is an apocalyptic number.

It is an amenable number.

667666733772 is an abundant number, since it is smaller than the sum of its proper divisors (890222311724).

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

667666733772 is a wasteful number, since it uses less digits than its factorization.

667666733772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55638894488 (or 55638894486 counting only the distinct ones).

The product of its digits is 336063168, while the sum is 66.

The spelling of 667666733772 in words is "six hundred sixty-seven billion, six hundred sixty-six million, seven hundred thirty-three thousand, seven hundred seventy-two".