81409041883 has 8 divisors (see below), whose sum is σ = 88190043200. Its totient is φ = 75146805864.

The previous prime is 81409041863. The next prime is 81409041899. The reversal of 81409041883 is 38814090418.

It is a de Polignac number, because none of the positive numbers 2^k-81409041883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81409041803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18525123 + ... + 18529516.

It is an arithmetic number, because the mean of its divisors is an integer number (11023755400).

Almost surely, 2^81409041883 is an apocalyptic number.

81409041883 is a deficient number, since it is larger than the sum of its proper divisors (6781001317).

81409041883 is an equidigital number, since it uses as much as digits as its factorization.

81409041883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37054678 (or 37054652 counting only the distinct ones).

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

The spelling of 81409041883 in words is "eighty-one billion, four hundred nine million, forty-one thousand, eight hundred eighty-three".