81340734411 has 32 divisors (see below), whose sum is σ = 127612526400. Its totient is φ = 51029637120.

The previous prime is 81340734407. The next prime is 81340734457. The reversal of 81340734411 is 11443704318.

It is not a de Polignac number, because 81340734411 - 2² = 81340734407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81340734611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5688591 + ... + 5702871.

It is an arithmetic number, because the mean of its divisors is an integer number (3987891450).

Almost surely, 2^81340734411 is an apocalyptic number.

81340734411 is a deficient number, since it is larger than the sum of its proper divisors (46271791989).

81340734411 is a wasteful number, since it uses less digits than its factorization.

81340734411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26716 (or 26710 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 81340734411 in words is "eighty-one billion, three hundred forty million, seven hundred thirty-four thousand, four hundred eleven".