81448249332 has 24 divisors (see below), whose sum is σ = 195182292256. Its totient is φ = 26415648288.

The previous prime is 81448249321. The next prime is 81448249357. The reversal of 81448249332 is 23394284418.

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, 91720558 + ... + 91721445.

Almost surely, 2^81448249332 is an apocalyptic number.

It is an amenable number.

81448249332 is an abundant number, since it is smaller than the sum of its proper divisors (113734042924).

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

81448249332 is a wasteful number, since it uses less digits than its factorization.

81448249332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183442047 (or 183442045 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The spelling of 81448249332 in words is "eighty-one billion, four hundred forty-eight million, two hundred forty-nine thousand, three hundred thirty-two".