81272085207 has 16 divisors (see below), whose sum is σ = 109216555008. Its totient is φ = 53754704640.

The previous prime is 81272085197. The next prime is 81272085227. The reversal of 81272085207 is 70258027218.

It is not a de Polignac number, because 81272085207 - 2⁶ = 81272085143 is a prime.

It is a super-3 number, since 3×81272085207³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272085227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750698 + ... + 1796520.

It is an arithmetic number, because the mean of its divisors is an integer number (6826034688).

Almost surely, 2^81272085207 is an apocalyptic number.

81272085207 is a deficient number, since it is larger than the sum of its proper divisors (27944469801).

81272085207 is a wasteful number, since it uses less digits than its factorization.

81272085207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50470.

The product of its (nonzero) digits is 125440, while the sum is 42.

The spelling of 81272085207 in words is "eighty-one billion, two hundred seventy-two million, eighty-five thousand, two hundred seven".