665131024871 has 2 divisors, whose sum is σ = 665131024872. Its totient is φ = 665131024870.

The previous prime is 665131024861. The next prime is 665131024913. The reversal of 665131024871 is 178420131566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665131024871 - 2³⁸ = 390253117927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665131024861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332565512435 + 332565512436.

It is an arithmetic number, because the mean of its divisors is an integer number (332565512436).

Almost surely, 2^665131024871 is an apocalyptic number.

665131024871 is a deficient number, since it is larger than the sum of its proper divisors (1).

665131024871 is an equidigital number, since it uses as much as digits as its factorization.

665131024871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 665131024871 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-four thousand, eight hundred seventy-one".