81148348828 has 24 divisors (see below), whose sum is σ = 150390847152. Its totient is φ = 38180415744.

The previous prime is 81148348823. The next prime is 81148348901. The reversal of 81148348828 is 82884384118.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81148348823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271026 + ... + 485542.

It is an arithmetic number, because the mean of its divisors is an integer number (6266285298).

Almost surely, 2^81148348828 is an apocalyptic number.

It is an amenable number.

81148348828 is a deficient number, since it is larger than the sum of its proper divisors (69242498324).

81148348828 is a wasteful number, since it uses less digits than its factorization.

81148348828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220101 (or 220099 counting only the distinct ones).

The product of its digits is 3145728, while the sum is 55.

The spelling of 81148348828 in words is "eighty-one billion, one hundred forty-eight million, three hundred forty-eight thousand, eight hundred twenty-eight".