81416847436 has 18 divisors (see below), whose sum is σ = 148943584412. Its totient is φ = 38938491240.

The previous prime is 81416847401. The next prime is 81416847439. The reversal of 81416847436 is 63474861418.

It is not an unprimeable number, because it can be changed into a prime (81416847439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19236270 + ... + 19240501.

Almost surely, 2^81416847436 is an apocalyptic number.

It is an amenable number.

81416847436 is a deficient number, since it is larger than the sum of its proper divisors (67526736976).

81416847436 is a wasteful number, since it uses less digits than its factorization.

81416847436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38476821 (or 38476796 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 52.

The spelling of 81416847436 in words is "eighty-one billion, four hundred sixteen million, eight hundred forty-seven thousand, four hundred thirty-six".