166680726 has 16 divisors (see below), whose sum is σ = 336799344. Its totient is φ = 54987264.

The previous prime is 166680649. The next prime is 166680727. The reversal of 166680726 is 627086661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166680727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142615 + ... + 143778.

It is an arithmetic number, because the mean of its divisors is an integer number (21049959).

Almost surely, 2^166680726 is an apocalyptic number.

166680726 is an abundant number, since it is smaller than the sum of its proper divisors (170118618).

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

166680726 is a wasteful number, since it uses less digits than its factorization.

166680726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286495.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 166680726 is about 12910.4889915138. The cubic root of 166680726 is about 550.3366820126.

The spelling of 166680726 in words is "one hundred sixty-six million, six hundred eighty thousand, seven hundred twenty-six".