168708749687 has 4 divisors (see below), whose sum is σ = 168716477640. Its totient is φ = 168701021736.

The previous prime is 168708749641. The next prime is 168708749731. The reversal of 168708749687 is 786947807861.

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

It is a cyclic number.

It is not a de Polignac number, because 168708749687 - 2²⁰ = 168707701111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168708749687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168708749617) 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, 3831137 + ... + 3874922.

It is an arithmetic number, because the mean of its divisors is an integer number (42179119410).

Almost surely, 2^168708749687 is an apocalyptic number.

168708749687 is a deficient number, since it is larger than the sum of its proper divisors (7727953).

168708749687 is an equidigital number, since it uses as much as digits as its factorization.

168708749687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7727952.

The product of its (nonzero) digits is 227598336, while the sum is 71.

The spelling of 168708749687 in words is "one hundred sixty-eight billion, seven hundred eight million, seven hundred forty-nine thousand, six hundred eighty-seven".