81444671434 has 64 divisors (see below), whose sum is σ = 145342310400. Its totient is φ = 33490050048.

The previous prime is 81444671401. The next prime is 81444671447. The reversal of 81444671434 is 43417644418.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51974119 + ... + 51975685.

It is an arithmetic number, because the mean of its divisors is an integer number (2270973600).

Almost surely, 2^81444671434 is an apocalyptic number.

81444671434 is a deficient number, since it is larger than the sum of its proper divisors (63897638966).

81444671434 is a wasteful number, since it uses less digits than its factorization.

81444671434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327.

The product of its digits is 1032192, while the sum is 46.

The spelling of 81444671434 in words is "eighty-one billion, four hundred forty-four million, six hundred seventy-one thousand, four hundred thirty-four".