166861267583 has 16 divisors (see below), whose sum is σ = 174815539200. Its totient is φ = 159267659320.

The previous prime is 166861267561. The next prime is 166861267619. The reversal of 166861267583 is 385762168661.

It is not a de Polignac number, because 166861267583 - 2¹² = 166861263487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166861267283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5813678 + ... + 5842308.

It is an arithmetic number, because the mean of its divisors is an integer number (10925971200).

Almost surely, 2^166861267583 is an apocalyptic number.

166861267583 is a deficient number, since it is larger than the sum of its proper divisors (7954271617).

166861267583 is an frugal number, since it uses more digits than its factorization.

166861267583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29179 (or 29133 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 59.

The spelling of 166861267583 in words is "one hundred sixty-six billion, eight hundred sixty-one million, two hundred sixty-seven thousand, five hundred eighty-three".