166878786063 has 32 divisors (see below), whose sum is σ = 245872742400. Its totient is φ = 99831045600.

The previous prime is 166878786049. The next prime is 166878786079. The reversal of 166878786063 is 360687878661.

It is a Cunningham number, because it is equal to 408508²-1.

It is not a de Polignac number, because 166878786063 - 2¹² = 166878781967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166878785985 and 166878786003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166878786023) 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 31 ways as a sum of consecutive naturals, for example, 13474608 + ... + 13486986.

It is an arithmetic number, because the mean of its divisors is an integer number (7683523200).

Almost surely, 2^166878786063 is an apocalyptic number.

166878786063 is a deficient number, since it is larger than the sum of its proper divisors (78993956337).

166878786063 is a wasteful number, since it uses less digits than its factorization.

166878786063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17643.

The product of its (nonzero) digits is 97542144, while the sum is 66.

The spelling of 166878786063 in words is "one hundred sixty-six billion, eight hundred seventy-eight million, seven hundred eighty-six thousand, sixty-three".