168725871887 has 4 divisors (see below), whose sum is σ = 170396425176. Its totient is φ = 167055318600.

The previous prime is 168725871871. The next prime is 168725871889. The reversal of 168725871887 is 788178527861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788178527861 = 739 ⋅1066547399.

It is a cyclic number.

It is not a de Polignac number, because 168725871887 - 2⁴ = 168725871871 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 (168725871889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835276493 + ... + 835276694.

It is an arithmetic number, because the mean of its divisors is an integer number (42599106294).

Almost surely, 2^168725871887 is an apocalyptic number.

168725871887 is a deficient number, since it is larger than the sum of its proper divisors (1670553289).

168725871887 is a wasteful number, since it uses less digits than its factorization.

168725871887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670553288.

The product of its digits is 84295680, while the sum is 68.

The spelling of 168725871887 in words is "one hundred sixty-eight billion, seven hundred twenty-five million, eight hundred seventy-one thousand, eight hundred eighty-seven".