665877641705822 has 32 divisors (see below), whose sum is σ = 1247660518121472. Its totient is φ = 259492418675424.

The previous prime is 665877641705791. The next prime is 665877641705909. The reversal of 665877641705822 is 228507146778566.

It is a self number, because there is not a number n which added to its sum of digits gives 665877641705822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27303483038 + ... + 27303507425.

It is an arithmetic number, because the mean of its divisors is an integer number (38989391191296).

Almost surely, 2^{665877641705822} is an apocalyptic number.

665877641705822 is a deficient number, since it is larger than the sum of its proper divisors (581782876415650).

665877641705822 is a wasteful number, since it uses less digits than its factorization.

665877641705822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54606990552.

The product of its (nonzero) digits is 1896652800, while the sum is 74.

The spelling of 665877641705822 in words is "six hundred sixty-five trillion, eight hundred seventy-seven billion, six hundred forty-one million, seven hundred five thousand, eight hundred twenty-two".