666066692 has 6 divisors (see below), whose sum is σ = 1165616718. Its totient is φ = 333033344.

The previous prime is 666066629. The next prime is 666066703. The reversal of 666066692 is 296660666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 485056576 + 181010116 = 22024^2 + 13454^2 .

It is a super-3 number, since 3×666066692³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258333 + ... + 83258340.

It is an arithmetic number, because the mean of its divisors is an integer number (194269453).

Almost surely, 2^666066692 is an apocalyptic number.

It is an amenable number.

666066692 is a deficient number, since it is larger than the sum of its proper divisors (499550026).

666066692 is a wasteful number, since it uses less digits than its factorization.

666066692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166516677 (or 166516675 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 47.

The square root of 666066692 is about 25808.2679000354. The cubic root of 666066692 is about 873.3183230073.

The spelling of 666066692 in words is "six hundred sixty-six million, sixty-six thousand, six hundred ninety-two".