81272536546 has 8 divisors (see below), whose sum is σ = 121912459200. Its totient is φ = 40635050148.

The previous prime is 81272536529. The next prime is 81272536547. The reversal of 81272536546 is 64563527218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81272536546² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81272536546.

It is not an unprimeable number, because it can be changed into a prime (81272536547) 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, 523246 + ... + 660553.

It is an arithmetic number, because the mean of its divisors is an integer number (15239057400).

Almost surely, 2^81272536546 is an apocalyptic number.

81272536546 is a deficient number, since it is larger than the sum of its proper divisors (40639922654).

81272536546 is a wasteful number, since it uses less digits than its factorization.

81272536546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218128.

The product of its digits is 2419200, while the sum is 49.

The spelling of 81272536546 in words is "eighty-one billion, two hundred seventy-two million, five hundred thirty-six thousand, five hundred forty-six".