168920751 has 8 divisors (see below), whose sum is σ = 225308160. Its totient is φ = 112573592.

The previous prime is 168920743. The next prime is 168920753. The reversal of 168920751 is 157029861.

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 168920751 - 2³ = 168920743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168920753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1696 + ... + 18458.

It is an arithmetic number, because the mean of its divisors is an integer number (28163520).

Almost surely, 2^168920751 is an apocalyptic number.

168920751 is a deficient number, since it is larger than the sum of its proper divisors (56387409).

168920751 is a wasteful number, since it uses less digits than its factorization.

168920751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20125.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 168920751 is about 12996.9516041263. The cubic root of 168920751 is about 552.7910477623.

The spelling of 168920751 in words is "one hundred sixty-eight million, nine hundred twenty thousand, seven hundred fifty-one".