665349696 has 168 divisors, whose sum is σ = 2095951104. Its totient is φ = 200125440.

The previous prime is 665349691. The next prime is 665349739. The reversal of 665349696 is 696943566.

It is a happy number.

665349696 is a `hidden beast` number, since 6 + 65 + 3 + 496 + 96 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665349691) 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, 1095825 + ... + 1096431.

Almost surely, 2^665349696 is an apocalyptic number.

665349696 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665349696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047975552).

665349696 is an abundant number, since it is smaller than the sum of its proper divisors (1430601408).

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

665349696 is a wasteful number, since it uses less digits than its factorization.

665349696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 796 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 54.

The square root of 665349696 is about 25794.3733399360. The cubic root of 665349696 is about 873.0048456095.

The spelling of 665349696 in words is "six hundred sixty-five million, three hundred forty-nine thousand, six hundred ninety-six".