166861261473 has 16 divisors (see below), whose sum is σ = 223034849856. Its totient is φ = 110964349440.

The previous prime is 166861261471. The next prime is 166861261477. The reversal of 166861261473 is 374162168661.

166861261473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166861261473 - 2¹ = 166861261471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166861261471) 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, 14617138 + ... + 14628548.

It is an arithmetic number, because the mean of its divisors is an integer number (13939678116).

Almost surely, 2^166861261473 is an apocalyptic number.

It is an amenable number.

166861261473 is a deficient number, since it is larger than the sum of its proper divisors (56173588383).

166861261473 is a wasteful number, since it uses less digits than its factorization.

166861261473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23104.

The product of its digits is 1741824, while the sum is 51.

The spelling of 166861261473 in words is "one hundred sixty-six billion, eight hundred sixty-one million, two hundred sixty-one thousand, four hundred seventy-three".