665501952 has 144 divisors (see below), whose sum is σ = 1836656640. Its totient is φ = 213805056.

The previous prime is 665501939. The next prime is 665501983. The reversal of 665501952 is 259105566.

It is a self number, because there is not a number n which added to its sum of digits gives 665501952.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3717799 + ... + 3717977.

It is an arithmetic number, because the mean of its divisors is an integer number (12754560).

Almost surely, 2^665501952 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 665501952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (918328320).

665501952 is an abundant number, since it is smaller than the sum of its proper divisors (1171154688).

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

665501952 is a wasteful number, since it uses less digits than its factorization.

665501952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 665501952 is about 25797.3245124373. The cubic root of 665501952 is about 873.0714321924.

The spelling of 665501952 in words is "six hundred sixty-five million, five hundred one thousand, nine hundred fifty-two".