81149522340 has 96 divisors (see below), whose sum is σ = 228374625024. Its totient is φ = 21530050560.

The previous prime is 81149522327. The next prime is 81149522341. The reversal of 81149522340 is 4322594118.

It is not an unprimeable number, because it can be changed into a prime (81149522341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10763052 + ... + 10770588.

It is an arithmetic number, because the mean of its divisors is an integer number (2378902344).

Almost surely, 2^81149522340 is an apocalyptic number.

It is an amenable number.

81149522340 is an abundant number, since it is smaller than the sum of its proper divisors (147225102684).

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

81149522340 is a wasteful number, since it uses less digits than its factorization.

81149522340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8437 (or 8435 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 81149522340 in words is "eighty-one billion, one hundred forty-nine million, five hundred twenty-two thousand, three hundred forty".