81726103516 has 24 divisors (see below), whose sum is σ = 143663773680. Its totient is φ = 40679721600.

The previous prime is 81726103507. The next prime is 81726103517. The reversal of 81726103516 is 61530162718.

It is a happy number.

It is a super-4 number, since 4×81726103516⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81726103517) 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, 752406 + ... + 854146.

It is an arithmetic number, because the mean of its divisors is an integer number (5985990570).

Almost surely, 2^81726103516 is an apocalyptic number.

It is an amenable number.

81726103516 is a deficient number, since it is larger than the sum of its proper divisors (61937670164).

81726103516 is a wasteful number, since it uses less digits than its factorization.

81726103516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102645 (or 102643 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 81726103516 in words is "eighty-one billion, seven hundred twenty-six million, one hundred three thousand, five hundred sixteen".