665131537867 has 2 divisors, whose sum is σ = 665131537868. Its totient is φ = 665131537866.

The previous prime is 665131537853. The next prime is 665131537949. The reversal of 665131537867 is 768735131566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665131537867 - 2¹¹ = 665131535819 is a prime.

It is not a weakly prime, because it can be changed into another prime (665131537267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332565768933 + 332565768934.

It is an arithmetic number, because the mean of its divisors is an integer number (332565768934).

Almost surely, 2^665131537867 is an apocalyptic number.

665131537867 is a deficient number, since it is larger than the sum of its proper divisors (1).

665131537867 is an equidigital number, since it uses as much as digits as its factorization.

665131537867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19051200, while the sum is 58.

The spelling of 665131537867 in words is "six hundred sixty-five billion, one hundred thirty-one million, five hundred thirty-seven thousand, eight hundred sixty-seven".