665140782 has 16 divisors (see below), whose sum is σ = 1330560720. Its totient is φ = 221667072.

The previous prime is 665140747. The next prime is 665140799. The reversal of 665140782 is 287041566.

It is a self number, because there is not a number n which added to its sum of digits gives 665140782.

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 7 ways as a sum of consecutive naturals, for example, 31848 + ... + 48420.

It is an arithmetic number, because the mean of its divisors is an integer number (83160045).

Almost surely, 2^665140782 is an apocalyptic number.

665140782 is an abundant number, since it is smaller than the sum of its proper divisors (665419938).

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

665140782 is a wasteful number, since it uses less digits than its factorization.

665140782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23267.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 665140782 is about 25790.3234179023. The cubic root of 665140782 is about 872.9134640760.

The spelling of 665140782 in words is "six hundred sixty-five million, one hundred forty thousand, seven hundred eighty-two".