71625806581 has 8 divisors (see below), whose sum is σ = 81867719360. Its totient is φ = 61386307488.

The previous prime is 71625806509. The next prime is 71625806627. The reversal of 71625806581 is 18560852617.

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 71625806581 - 2¹⁹ = 71625282293 is a prime.

It is a super-2 number, since 2×71625806581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71625806881) 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 7 ways as a sum of consecutive naturals, for example, 539376 + ... + 658921.

It is an arithmetic number, because the mean of its divisors is an integer number (10233464920).

Almost surely, 2^71625806581 is an apocalyptic number.

It is an amenable number.

71625806581 is a deficient number, since it is larger than the sum of its proper divisors (10241912779).

71625806581 is a wasteful number, since it uses less digits than its factorization.

71625806581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206843.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 71625806581 in words is "seventy-one billion, six hundred twenty-five million, eight hundred six thousand, five hundred eighty-one".