81726075273 has 4 divisors (see below), whose sum is σ = 108968100368. Its totient is φ = 54484050180.

The previous prime is 81726075257. The next prime is 81726075289. The reversal of 81726075273 is 37257062718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (81726075257) and next prime (81726075289).

It is not a de Polignac number, because 81726075273 - 2⁴ = 81726075257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81726075073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13621012543 + ... + 13621012548.

It is an arithmetic number, because the mean of its divisors is an integer number (27242025092).

Almost surely, 2^81726075273 is an apocalyptic number.

It is an amenable number.

81726075273 is a deficient number, since it is larger than the sum of its proper divisors (27242025095).

81726075273 is a wasteful number, since it uses less digits than its factorization.

81726075273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27242025094.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 81726075273 in words is "eighty-one billion, seven hundred twenty-six million, seventy-five thousand, two hundred seventy-three".