81272827616 has 24 divisors (see below), whose sum is σ = 160021845144. Its totient is φ = 40632359040.

The previous prime is 81272827591. The next prime is 81272827621. The reversal of 81272827616 is 61672827218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213011 + ... + 455981.

It is an arithmetic number, because the mean of its divisors is an integer number (6667576881).

Almost surely, 2^81272827616 is an apocalyptic number.

It is an amenable number.

81272827616 is a deficient number, since it is larger than the sum of its proper divisors (78749017528).

81272827616 is a wasteful number, since it uses less digits than its factorization.

81272827616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253434 (or 253426 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The spelling of 81272827616 in words is "eighty-one billion, two hundred seventy-two million, eight hundred twenty-seven thousand, six hundred sixteen".