665122040 has 64 divisors (see below), whose sum is σ = 1659402720. Its totient is φ = 237888000.

The previous prime is 665122039. The next prime is 665122057. The reversal of 665122040 is 40221566.

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, 14450 + ... + 39230.

Almost surely, 2^665122040 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 665122040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829701360).

665122040 is an abundant number, since it is smaller than the sum of its proper divisors (994280680).

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

665122040 is a wasteful number, since it uses less digits than its factorization.

665122040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24864 (or 24860 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 665122040 is about 25789.9600620086. The cubic root of 665122040 is about 872.9052651612.

The spelling of 665122040 in words is "six hundred sixty-five million, one hundred twenty-two thousand, forty".