81712236626 has 16 divisors (see below), whose sum is σ = 124072995840. Its totient is φ = 40357381680.

The previous prime is 81712236511. The next prime is 81712236637. The reversal of 81712236626 is 62663221718.

It is a super-2 number, since 2×81712236626² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644240 + ... + 760571.

It is an arithmetic number, because the mean of its divisors is an integer number (7754562240).

Almost surely, 2^81712236626 is an apocalyptic number.

81712236626 is a deficient number, since it is larger than the sum of its proper divisors (42360759214).

81712236626 is a wasteful number, since it uses less digits than its factorization.

81712236626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405169.

The product of its digits is 290304, while the sum is 44.

The spelling of 81712236626 in words is "eighty-one billion, seven hundred twelve million, two hundred thirty-six thousand, six hundred twenty-six".