665620314782 has 4 divisors (see below), whose sum is σ = 998430472176. Its totient is φ = 332810157390.

The previous prime is 665620314707. The next prime is 665620314787. The reversal of 665620314782 is 287413026566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665620314782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665620314787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166405078694 + ... + 166405078697.

It is an arithmetic number, because the mean of its divisors is an integer number (249607618044).

Almost surely, 2^665620314782 is an apocalyptic number.

665620314782 is a deficient number, since it is larger than the sum of its proper divisors (332810157394).

665620314782 is a wasteful number, since it uses less digits than its factorization.

665620314782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332810157393.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 665620314782 in words is "six hundred sixty-five billion, six hundred twenty million, three hundred fourteen thousand, seven hundred eighty-two".