665131567047 has 16 divisors (see below), whose sum is σ = 892018280160. Its totient is φ = 440833236992.

The previous prime is 665131567021. The next prime is 665131567057. The reversal of 665131567047 is 740765131566.

It is a cyclic number.

It is not a de Polignac number, because 665131567047 - 2⁸ = 665131566791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665131567057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17403223 + ... + 17441399.

It is an arithmetic number, because the mean of its divisors is an integer number (55751142510).

Almost surely, 2^665131567047 is an apocalyptic number.

665131567047 is a deficient number, since it is larger than the sum of its proper divisors (226886713113).

665131567047 is a wasteful number, since it uses less digits than its factorization.

665131567047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71922.

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 665131567047 in words is "six hundred sixty-five billion, one hundred thirty-one million, five hundred sixty-seven thousand, forty-seven".