81981044614 has 16 divisors (see below), whose sum is σ = 140765990400. Its totient is φ = 35077969224.

The previous prime is 81981044567. The next prime is 81981044623. The reversal of 81981044614 is 41644018918.

It is a congruent number.

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, 4721374 + ... + 4738705.

It is an arithmetic number, because the mean of its divisors is an integer number (8797874400).

Almost surely, 2^81981044614 is an apocalyptic number.

81981044614 is a deficient number, since it is larger than the sum of its proper divisors (58784945786).

81981044614 is a wasteful number, since it uses less digits than its factorization.

81981044614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460707.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 81981044614 in words is "eighty-one billion, nine hundred eighty-one million, forty-four thousand, six hundred fourteen".