166689302887 has 4 divisors (see below), whose sum is σ = 176494556016. Its totient is φ = 156884049760.

The previous prime is 166689302867. The next prime is 166689302891. The reversal of 166689302887 is 788203986661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166689302887 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 (166689302827) 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 3 ways as a sum of consecutive naturals, for example, 4902626539 + ... + 4902626572.

It is an arithmetic number, because the mean of its divisors is an integer number (44123639004).

Almost surely, 2^166689302887 is an apocalyptic number.

166689302887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

166689302887 is a deficient number, since it is larger than the sum of its proper divisors (9805253129).

166689302887 is an equidigital number, since it uses as much as digits as its factorization.

166689302887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9805253128.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 166689302887 in words is "one hundred sixty-six billion, six hundred eighty-nine million, three hundred two thousand, eight hundred eighty-seven".