81453143325 has 24 divisors (see below), whose sum is σ = 134678164768. Its totient is φ = 43438783680.

The previous prime is 81453143297. The next prime is 81453143327. The reversal of 81453143325 is 52334135418.

It is not a de Polignac number, because 81453143325 - 2⁵ = 81453143293 is a prime.

It is a super-2 number, since 2×81453143325² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81453143327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1570254 + ... + 1621296.

Almost surely, 2^81453143325 is an apocalyptic number.

It is an amenable number.

81453143325 is a deficient number, since it is larger than the sum of its proper divisors (53225021443).

81453143325 is a wasteful number, since it uses less digits than its factorization.

81453143325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72333 (or 72328 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The spelling of 81453143325 in words is "eighty-one billion, four hundred fifty-three million, one hundred forty-three thousand, three hundred twenty-five".