665603471238 has 16 divisors (see below), whose sum is σ = 1349956336896. Its totient is φ = 218742924680.

The previous prime is 665603471237. The next prime is 665603471243. The reversal of 665603471238 is 832174306566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665603471237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781224306 + ... + 781225157.

It is an arithmetic number, because the mean of its divisors is an integer number (84372271056).

Almost surely, 2^665603471238 is an apocalyptic number.

665603471238 is an abundant number, since it is smaller than the sum of its proper divisors (684352865658).

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

665603471238 is a wasteful number, since it uses less digits than its factorization.

665603471238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562449539.

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 665603471238 in words is "six hundred sixty-five billion, six hundred three million, four hundred seventy-one thousand, two hundred thirty-eight".