168668551 has 8 divisors (see below), whose sum is σ = 177062400. Its totient is φ = 160459320.

The previous prime is 168668531. The next prime is 168668557. The reversal of 168668551 is 155866861.

168668551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168668551 - 2²³ = 160279943 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 (168668557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44281 + ... + 47938.

It is an arithmetic number, because the mean of its divisors is an integer number (22132800).

Almost surely, 2^168668551 is an apocalyptic number.

168668551 is a deficient number, since it is larger than the sum of its proper divisors (8393849).

168668551 is an equidigital number, since it uses as much as digits as its factorization.

168668551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92309.

The product of its digits is 345600, while the sum is 46.

The square root of 168668551 is about 12987.2457049214. The cubic root of 168668551 is about 552.5158036197.

The spelling of 168668551 in words is "one hundred sixty-eight million, six hundred sixty-eight thousand, five hundred fifty-one".