168645505 has 48 divisors (see below), whose sum is σ = 244992384. Its totient is φ = 111041280.

The previous prime is 168645497. The next prime is 168645509. The reversal of 168645505 is 505546861.

It is not a de Polignac number, because 168645505 - 2³ = 168645497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168645509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1034554 + ... + 1034716.

It is an arithmetic number, because the mean of its divisors is an integer number (5104008).

Almost surely, 2^168645505 is an apocalyptic number.

It is an amenable number.

168645505 is a deficient number, since it is larger than the sum of its proper divisors (76346879).

168645505 is a wasteful number, since it uses less digits than its factorization.

168645505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 168645505 is about 12986.3584195108. The cubic root of 168645505 is about 552.4906381712.

The spelling of 168645505 in words is "one hundred sixty-eight million, six hundred forty-five thousand, five hundred five".