665195168 has 96 divisors (see below), whose sum is σ = 1524096000. Its totient is φ = 282597120.

The previous prime is 665195161. The next prime is 665195171. The reversal of 665195168 is 861591566.

It is a super-2 number, since 2×665195168² = 884969223061096448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665195161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527723 + ... + 528981.

It is an arithmetic number, because the mean of its divisors is an integer number (15876000).

Almost surely, 2^665195168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665195168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762048000).

665195168 is an abundant number, since it is smaller than the sum of its proper divisors (858900832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665195168 is a wasteful number, since it uses less digits than its factorization.

665195168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378 (or 1370 counting only the distinct ones).

The product of its digits is 388800, while the sum is 47.

The square root of 665195168 is about 25791.3777840580. The cubic root of 665195168 is about 872.9372550183.

The spelling of 665195168 in words is "six hundred sixty-five million, one hundred ninety-five thousand, one hundred sixty-eight".