81534817276 has 48 divisors (see below), whose sum is σ = 161103559680. Its totient is φ = 35770896000.

The previous prime is 81534817229. The next prime is 81534817277. The reversal of 81534817276 is 67271843518.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81534817277) 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, 438096 + ... + 595816.

It is an arithmetic number, because the mean of its divisors is an integer number (3356324160).

Almost surely, 2^81534817276 is an apocalyptic number.

It is an amenable number.

81534817276 is a deficient number, since it is larger than the sum of its proper divisors (79568742404).

81534817276 is a wasteful number, since it uses less digits than its factorization.

81534817276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158146 (or 158144 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The spelling of 81534817276 in words is "eighty-one billion, five hundred thirty-four million, eight hundred seventeen thousand, two hundred seventy-six".