166409326787 has 16 divisors (see below), whose sum is σ = 184112037888. Its totient is φ = 149137692480.

The previous prime is 166409326729. The next prime is 166409326789. The reversal of 166409326787 is 787623904661.

166409326787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166409326787 - 2¹² = 166409322691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166409326789) 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 15 ways as a sum of consecutive naturals, for example, 1672478 + ... + 1769180.

It is an arithmetic number, because the mean of its divisors is an integer number (11507002368).

Almost surely, 2^166409326787 is an apocalyptic number.

166409326787 is a deficient number, since it is larger than the sum of its proper divisors (17702711101).

166409326787 is a wasteful number, since it uses less digits than its factorization.

166409326787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98930.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 166409326787 in words is "one hundred sixty-six billion, four hundred nine million, three hundred twenty-six thousand, seven hundred eighty-seven".