81269212275 has 24 divisors (see below), whose sum is σ = 149294554160. Its totient is φ = 43343579520.

The previous prime is 81269212267. The next prime is 81269212291. The reversal of 81269212275 is 57221296218.

It is not a de Polignac number, because 81269212275 - 2³ = 81269212267 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81269212275.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60198742 + ... + 60200091.

Almost surely, 2^81269212275 is an apocalyptic number.

81269212275 is a deficient number, since it is larger than the sum of its proper divisors (68025341885).

81269212275 is a wasteful number, since it uses less digits than its factorization.

81269212275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120398852 (or 120398841 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 81269212275 in words is "eighty-one billion, two hundred sixty-nine million, two hundred twelve thousand, two hundred seventy-five".