81447104744 has 32 divisors (see below), whose sum is σ = 154129694400. Its totient is φ = 40346866560.

The previous prime is 81447104723. The next prime is 81447104803. The reversal of 81447104744 is 44740174418.

It is a junction number, because it is equal to n+sod(n) for n = 81447104695 and 81447104704.

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, 583637 + ... + 709595.

It is an arithmetic number, because the mean of its divisors is an integer number (4816552950).

Almost surely, 2^81447104744 is an apocalyptic number.

It is an amenable number.

81447104744 is a deficient number, since it is larger than the sum of its proper divisors (72682589656).

81447104744 is a wasteful number, since it uses less digits than its factorization.

81447104744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126713 (or 126709 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 44.

The spelling of 81447104744 in words is "eighty-one billion, four hundred forty-seven million, one hundred four thousand, seven hundred forty-four".