125001666 has 48 divisors (see below), whose sum is σ = 277520256. Its totient is φ = 40648608.

The previous prime is 125001631. The next prime is 125001683. The reversal of 125001666 is 666100521.

It is a happy number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 269751 + ... + 270213.

It is an arithmetic number, because the mean of its divisors is an integer number (5781672).

Almost surely, 2^125001666 is an apocalyptic number.

125001666 is an abundant number, since it is smaller than the sum of its proper divisors (152518590).

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

125001666 is a wasteful number, since it uses less digits than its factorization.

125001666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 125001666 is about 11180.4143930357. The cubic root of 125001666 is about 500.0022213235.

The spelling of 125001666 in words is "one hundred twenty-five million, one thousand, six hundred sixty-six".