665382824605 has 4 divisors (see below), whose sum is σ = 798459389532. Its totient is φ = 532306259680.

The previous prime is 665382824581. The next prime is 665382824633. The reversal of 665382824605 is 506428283566.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 269363076004 + 396019748601 = 519002^2 + 629301^2 .

It is not a de Polignac number, because 665382824605 - 2¹⁷ = 665382693533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66538282456 + ... + 66538282465.

It is an arithmetic number, because the mean of its divisors is an integer number (199614847383).

Almost surely, 2^665382824605 is an apocalyptic number.

It is an amenable number.

665382824605 is a deficient number, since it is larger than the sum of its proper divisors (133076564927).

665382824605 is a wasteful number, since it uses less digits than its factorization.

665382824605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133076564926.

The product of its (nonzero) digits is 16588800, while the sum is 55.

The spelling of 665382824605 in words is "six hundred sixty-five billion, three hundred eighty-two million, eight hundred twenty-four thousand, six hundred five".