81726103523 has 2 divisors, whose sum is σ = 81726103524. Its totient is φ = 81726103522.

The previous prime is 81726103519. The next prime is 81726103577. The reversal of 81726103523 is 32530162718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81726103523 - 2² = 81726103519 is a prime.

It is a super-4 number, since 4×81726103523⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81726163523) 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 as a sum of consecutive naturals, namely, 40863051761 + 40863051762.

It is an arithmetic number, because the mean of its divisors is an integer number (40863051762).

Almost surely, 2^81726103523 is an apocalyptic number.

81726103523 is a deficient number, since it is larger than the sum of its proper divisors (1).

81726103523 is an equidigital number, since it uses as much as digits as its factorization.

81726103523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 81726103523 in words is "eighty-one billion, seven hundred twenty-six million, one hundred three thousand, five hundred twenty-three".