166540412666 has 16 divisors (see below), whose sum is σ = 250740466944. Its totient is φ = 82960721424.

The previous prime is 166540412543. The next prime is 166540412669. The reversal of 166540412666 is 666214045661.

166540412666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 166540412666.

It is not an unprimeable number, because it can be changed into a prime (166540412669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605951 + ... + 836813.

It is an arithmetic number, because the mean of its divisors is an integer number (15671279184).

Almost surely, 2^166540412666 is an apocalyptic number.

166540412666 is a deficient number, since it is larger than the sum of its proper divisors (84200054278).

166540412666 is a wasteful number, since it uses less digits than its factorization.

166540412666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232205.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 166540412666 in words is "one hundred sixty-six billion, five hundred forty million, four hundred twelve thousand, six hundred sixty-six".