166666750001 has 4 divisors (see below), whose sum is σ = 166667663604. Its totient is φ = 166665836400.

The previous prime is 166666749989. The next prime is 166666750021. The reversal of 166666750001 is 100057666661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19633614400 + 147033135601 = 140120^2 + 383449^2 .

It is a cyclic number.

It is not a de Polignac number, because 166666750001 - 2⁶ = 166666749937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166666750021) 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, 79010 + ... + 582731.

It is an arithmetic number, because the mean of its divisors is an integer number (41666915901).

Almost surely, 2^166666750001 is an apocalyptic number.

It is an amenable number.

166666750001 is a deficient number, since it is larger than the sum of its proper divisors (913603).

166666750001 is an equidigital number, since it uses as much as digits as its factorization.

166666750001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913602.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 166666750001 in words is "one hundred sixty-six billion, six hundred sixty-six million, seven hundred fifty thousand, one".