81148374441 has 12 divisors (see below), whose sum is σ = 117224675568. Its totient is φ = 54094136184.

The previous prime is 81148374367. The next prime is 81148374449. The reversal of 81148374441 is 14447384118.

It is not a de Polignac number, because 81148374441 - 2⁷ = 81148374313 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81148374449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289255 + ... + 495948.

It is an arithmetic number, because the mean of its divisors is an integer number (9768722964).

Almost surely, 2^81148374441 is an apocalyptic number.

It is an amenable number.

81148374441 is a deficient number, since it is larger than the sum of its proper divisors (36076301127).

81148374441 is a wasteful number, since it uses less digits than its factorization.

81148374441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796692 (or 796689 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The spelling of 81148374441 in words is "eighty-one billion, one hundred forty-eight million, three hundred seventy-four thousand, four hundred forty-one".