81447170676 has 24 divisors (see below), whose sum is σ = 192449013120. Its totient is φ = 26805397632.

The previous prime is 81447170653. The next prime is 81447170681. The reversal of 81447170676 is 67607174418.

It is a super-2 number, since 2×81447170676² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42956421 + ... + 42958316.

It is an arithmetic number, because the mean of its divisors is an integer number (8018708880).

Almost surely, 2^81447170676 is an apocalyptic number.

It is an amenable number.

81447170676 is an abundant number, since it is smaller than the sum of its proper divisors (111001842444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81447170676 is a wasteful number, since it uses less digits than its factorization.

81447170676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85914823 (or 85914821 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 81447170676 in words is "eighty-one billion, four hundred forty-seven million, one hundred seventy thousand, six hundred seventy-six".