166131666 has 24 divisors (see below), whose sum is σ = 371564544. Its totient is φ = 53590680.

The previous prime is 166131653. The next prime is 166131671. The reversal of 166131666 is 666131661.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166131666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148306 + ... + 149421.

It is an arithmetic number, because the mean of its divisors is an integer number (15481856).

Almost surely, 2^166131666 is an apocalyptic number.

166131666 is an abundant number, since it is smaller than the sum of its proper divisors (205432878).

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

166131666 is a wasteful number, since it uses less digits than its factorization.

166131666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297766 (or 297763 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 166131666 is about 12889.2073456827. The cubic root of 166131666 is about 549.7317325323.

The spelling of 166131666 in words is "one hundred sixty-six million, one hundred thirty-one thousand, six hundred sixty-six".