81147733194 has 32 divisors (see below), whose sum is σ = 186368002560. Its totient is φ = 23295999600.

The previous prime is 81147733171. The next prime is 81147733201. The reversal of 81147733194 is 49133774118.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32354302 + ... + 32356809.

It is an arithmetic number, because the mean of its divisors is an integer number (5824000080).

Almost surely, 2^81147733194 is an apocalyptic number.

81147733194 is an abundant number, since it is smaller than the sum of its proper divisors (105220269366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81147733194 is a wasteful number, since it uses less digits than its factorization.

81147733194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64711146.

The product of its digits is 508032, while the sum is 48.

The spelling of 81147733194 in words is "eighty-one billion, one hundred forty-seven million, seven hundred thirty-three thousand, one hundred ninety-four".