168689365 has 16 divisors (see below), whose sum is σ = 218269296. Its totient is φ = 124416000.

The previous prime is 168689357. The next prime is 168689371. The reversal of 168689365 is 563986861.

It can be written as a sum of positive squares in 8 ways, for example, as 9778129 + 158911236 = 3127^2 + 12606^2 .

It is not a de Polignac number, because 168689365 - 2³ = 168689357 is a prime.

It is a super-2 number, since 2×168689365² = 56912203728206450, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (1866240) is a multiple of the sum of its prime divisors (3240).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103255 + ... + 104875.

It is an arithmetic number, because the mean of its divisors is an integer number (13641831).

Almost surely, 2^168689365 is an apocalyptic number.

It is an amenable number.

168689365 is a deficient number, since it is larger than the sum of its proper divisors (49579931).

168689365 is a wasteful number, since it uses less digits than its factorization.

168689365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240.

The product of its digits is 1866240, while the sum is 52.

The square root of 168689365 is about 12988.0470048426. The cubic root of 168689365 is about 552.5385298301.

The spelling of 168689365 in words is "one hundred sixty-eight million, six hundred eighty-nine thousand, three hundred sixty-five".