81433811345 has 8 divisors (see below), whose sum is σ = 97753176000. Its totient is φ = 65125314160.

The previous prime is 81433811341. The next prime is 81433811357. The reversal of 81433811345 is 54311833418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81433811345 - 2² = 81433811341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81433811341) 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, 2700371 + ... + 2730360.

It is an arithmetic number, because the mean of its divisors is an integer number (12219147000).

Almost surely, 2^81433811345 is an apocalyptic number.

It is an amenable number.

81433811345 is a deficient number, since it is larger than the sum of its proper divisors (16319364655).

81433811345 is a wasteful number, since it uses less digits than its factorization.

81433811345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433735.

The product of its digits is 138240, while the sum is 41.

The spelling of 81433811345 in words is "eighty-one billion, four hundred thirty-three million, eight hundred eleven thousand, three hundred forty-five".