665636415282 has 80 divisors (see below), whose sum is σ = 1535580909720. Its totient is φ = 215353458432.

The previous prime is 665636415277. The next prime is 665636415313. The reversal of 665636415282 is 282514636566.

665636415282 is a `hidden beast` number, since 6 + 6 + 56 + 3 + 64 + 1 + 528 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 627392310561 + 38244104721 = 792081^2 + 195561^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2315788 + ... + 2587304.

Almost surely, 2^665636415282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665636415282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767790454860).

665636415282 is an abundant number, since it is smaller than the sum of its proper divisors (869944494438).

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

665636415282 is a wasteful number, since it uses less digits than its factorization.

665636415282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271977 (or 271968 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 665636415282 in words is "six hundred sixty-five billion, six hundred thirty-six million, four hundred fifteen thousand, two hundred eighty-two".