71581662654481 has 8 divisors (see below), whose sum is σ = 81809441005760. Its totient is φ = 61354340939088.

The previous prime is 71581662654451. The next prime is 71581662654539. The reversal of 71581662654481 is 18445626618517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71581662654481 - 2¹¹ = 71581662652433 is a prime.

It is a super-2 number, since 2×71581662654481² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71581662654451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113822991 + ... + 114450148.

It is an arithmetic number, because the mean of its divisors is an integer number (10226180125720).

Almost surely, 2^{71581662654481} is an apocalyptic number.

It is an amenable number.

71581662654481 is a deficient number, since it is larger than the sum of its proper divisors (10227778351279).

71581662654481 is a wasteful number, since it uses less digits than its factorization.

71581662654481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228317943.

The product of its digits is 77414400, while the sum is 64.

The spelling of 71581662654481 in words is "seventy-one trillion, five hundred eighty-one billion, six hundred sixty-two million, six hundred fifty-four thousand, four hundred eighty-one".