166666791 has 16 divisors (see below), whose sum is σ = 224759808. Its totient is φ = 109850400.

The previous prime is 166666783. The next prime is 166666831. The reversal of 166666791 is 197666661.

It is not a de Polignac number, because 166666791 - 2³ = 166666783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166666791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102910 + ... + 104516.

It is an arithmetic number, because the mean of its divisors is an integer number (14047488).

Almost surely, 2^166666791 is an apocalyptic number.

166666791 is a deficient number, since it is larger than the sum of its proper divisors (58093017).

166666791 is a wasteful number, since it uses less digits than its factorization.

166666791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982.

The product of its digits is 489888, while the sum is 48.

The square root of 166666791 is about 12909.9493027665. The cubic root of 166666791 is about 550.3213449956.

The spelling of 166666791 in words is "one hundred sixty-six million, six hundred sixty-six thousand, seven hundred ninety-one".