168994665 has 24 divisors (see below), whose sum is σ = 334771008. Its totient is φ = 77254560.

The previous prime is 168994663. The next prime is 168994673. The reversal of 168994665 is 566499861.

It is a happy number.

It is not a de Polignac number, because 168994665 - 2¹ = 168994663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168994663) 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 23 ways as a sum of consecutive naturals, for example, 267931 + ... + 268560.

It is an arithmetic number, because the mean of its divisors is an integer number (13948792).

Almost surely, 2^168994665 is an apocalyptic number.

168994665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168994665 is a deficient number, since it is larger than the sum of its proper divisors (165776343).

168994665 is a wasteful number, since it uses less digits than its factorization.

168994665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536509 (or 536506 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 168994665 is about 12999.7948060729. The cubic root of 168994665 is about 552.8716635525.

The spelling of 168994665 in words is "one hundred sixty-eight million, nine hundred ninety-four thousand, six hundred sixty-five".