166666031 has 8 divisors (see below), whose sum is σ = 190603680. Its totient is φ = 142760448.

The previous prime is 166666001. The next prime is 166666057. The reversal of 166666031 is 130666661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166666031 is a prime.

It is a super-2 number, since 2×166666031² = 55555131778585922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166665982 and 166666000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4415 + ... + 18783.

It is an arithmetic number, because the mean of its divisors is an integer number (23825460).

Almost surely, 2^166666031 is an apocalyptic number.

166666031 is a deficient number, since it is larger than the sum of its proper divisors (23937649).

166666031 is a wasteful number, since it uses less digits than its factorization.

166666031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16033.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 166666031 is about 12909.9198680704. The cubic root of 166666031 is about 550.3205085065.

The spelling of 166666031 in words is "one hundred sixty-six million, six hundred sixty-six thousand, thirty-one".