665264236 has 96 divisors (see below), whose sum is σ = 1506032640. Its totient is φ = 249917184.

The previous prime is 665264219. The next prime is 665264297. The reversal of 665264236 is 632462566.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1917015 + ... + 1917361.

It is an arithmetic number, because the mean of its divisors is an integer number (15687840).

Almost surely, 2^665264236 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 665264236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753016320).

665264236 is an abundant number, since it is smaller than the sum of its proper divisors (840768404).

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

665264236 is a wasteful number, since it uses less digits than its factorization.

665264236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 621 counting only the distinct ones).

The product of its digits is 311040, while the sum is 40.

The square root of 665264236 is about 25792.7167239126. The cubic root of 665264236 is about 872.9674666747.

The spelling of 665264236 in words is "six hundred sixty-five million, two hundred sixty-four thousand, two hundred thirty-six".