81452040645109 has 8 divisors (see below), whose sum is σ = 81541275320000. Its totient is φ = 81362807284032.

The previous prime is 81452040645091. The next prime is 81452040645169. The reversal of 81452040645109 is 90154604025418.

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

It is a cyclic number.

It is not a de Polignac number, because 81452040645109 - 2²⁹ = 81451503774197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81452040645169) 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, 174688717 + ... + 175154365.

It is an arithmetic number, because the mean of its divisors is an integer number (10192659415000).

Almost surely, 2^{81452040645109} is an apocalyptic number.

It is an amenable number.

81452040645109 is a deficient number, since it is larger than the sum of its proper divisors (89234674891).

81452040645109 is a wasteful number, since it uses less digits than its factorization.

81452040645109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656907.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 81452040645109 in words is "eighty-one trillion, four hundred fifty-two billion, forty million, six hundred forty-five thousand, one hundred nine".