71581918163 has 32 divisors (see below), whose sum is σ = 89088007680. Its totient is φ = 56147040000.

The previous prime is 71581918159. The next prime is 71581918193. The reversal of 71581918163 is 36181918517.

It is not a de Polignac number, because 71581918163 - 2² = 71581918159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71581918193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 485768 + ... + 615738.

It is an arithmetic number, because the mean of its divisors is an integer number (2784000240).

Almost surely, 2^71581918163 is an apocalyptic number.

71581918163 is a deficient number, since it is larger than the sum of its proper divisors (17506089517).

71581918163 is a wasteful number, since it uses less digits than its factorization.

71581918163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130139.

The product of its digits is 362880, while the sum is 50.

The spelling of 71581918163 in words is "seventy-one billion, five hundred eighty-one million, nine hundred eighteen thousand, one hundred sixty-three".