166307791986 has 24 divisors (see below), whose sum is σ = 411809770944. Its totient is φ = 47516511960.

The previous prime is 166307791961. The next prime is 166307792003. The reversal of 166307791986 is 689197703661.

166307791986 is a `hidden beast` number, since 166 + 307 + 7 + 91 + 9 + 86 = 666.

166307791986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 659951430 + ... + 659951681.

It is an arithmetic number, because the mean of its divisors is an integer number (17158740456).

Almost surely, 2^166307791986 is an apocalyptic number.

166307791986 is an abundant number, since it is smaller than the sum of its proper divisors (245501978958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166307791986 is a wasteful number, since it uses less digits than its factorization.

166307791986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319903126 (or 1319903123 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 63.

The spelling of 166307791986 in words is "one hundred sixty-six billion, three hundred seven million, seven hundred ninety-one thousand, nine hundred eighty-six".