168331945 has 8 divisors (see below), whose sum is σ = 202342536. Its totient is φ = 134436096.

The previous prime is 168331903. The next prime is 168331951. The reversal of 168331945 is 549133861.

It can be written as a sum of positive squares in 4 ways, for example, as 10653696 + 157678249 = 3264^2 + 12557^2 .

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 168331945 - 2⁷ = 168331817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168331898 and 168331907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25422 + ... + 31351.

It is an arithmetic number, because the mean of its divisors is an integer number (25292817).

Almost surely, 2^168331945 is an apocalyptic number.

It is an amenable number.

168331945 is a deficient number, since it is larger than the sum of its proper divisors (34010591).

168331945 is an equidigital number, since it uses as much as digits as its factorization.

168331945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57371.

The product of its digits is 77760, while the sum is 40.

The square root of 168331945 is about 12974.2801341731. The cubic root of 168331945 is about 552.1480132820.

The spelling of 168331945 in words is "one hundred sixty-eight million, three hundred thirty-one thousand, nine hundred forty-five".