16666031 has 4 divisors (see below), whose sum is σ = 16813632. Its totient is φ = 16518432.

The previous prime is 16666019. The next prime is 16666033. The reversal of 16666031 is 13066661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16666031 - 2¹⁸ = 16403887 is a prime.

It is a super-2 number, since 2×16666031² = 555513178585922, 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 = 16665985 and 16666003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73631 + ... + 73856.

It is an arithmetic number, because the mean of its divisors is an integer number (4203408).

Almost surely, 2^16666031 is an apocalyptic number.

16666031 is a deficient number, since it is larger than the sum of its proper divisors (147601).

16666031 is a wasteful number, since it uses less digits than its factorization.

16666031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147600.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 16666031 is about 4082.4050509473. The cubic root of 16666031 is about 255.4332299741.

The spelling of 16666031 in words is "sixteen million, six hundred sixty-six thousand, thirty-one".