81447340334 has 8 divisors (see below), whose sum is σ = 122286160728. Its totient is φ = 40685286760.

The previous prime is 81447340321. The next prime is 81447340367. The reversal of 81447340334 is 43304374418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81447340291 and 81447340300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19189052 + ... + 19193295.

It is an arithmetic number, because the mean of its divisors is an integer number (15285770091).

Almost surely, 2^81447340334 is an apocalyptic number.

81447340334 is a deficient number, since it is larger than the sum of its proper divisors (40838820394).

81447340334 is a wasteful number, since it uses less digits than its factorization.

81447340334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38383410.

The product of its (nonzero) digits is 387072, while the sum is 41.

The spelling of 81447340334 in words is "eighty-one billion, four hundred forty-seven million, three hundred forty thousand, three hundred thirty-four".