166868671 has 4 divisors (see below), whose sum is σ = 167012344. Its totient is φ = 166725000.

The previous prime is 166868627. The next prime is 166868683. The reversal of 166868671 is 176868661.

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-166868671 is a prime.

It is a super-2 number, since 2×166868671² = 55690306722612482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166868171) 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, 70080 + ... + 72421.

It is an arithmetic number, because the mean of its divisors is an integer number (41753086).

Almost surely, 2^166868671 is an apocalyptic number.

166868671 is a deficient number, since it is larger than the sum of its proper divisors (143673).

166868671 is a wasteful number, since it uses less digits than its factorization.

166868671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143672.

The product of its digits is 580608, while the sum is 49.

The square root of 166868671 is about 12917.7657123823. The cubic root of 166868671 is about 550.5434529220.

The spelling of 166868671 in words is "one hundred sixty-six million, eight hundred sixty-eight thousand, six hundred seventy-one".