81345353529 has 12 divisors (see below), whose sum is σ = 119216882288. Its totient is φ = 49300214040.

The previous prime is 81345353521. The next prime is 81345353561. The reversal of 81345353529 is 92535354318.

It is not a de Polignac number, because 81345353529 - 2³ = 81345353521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81345353521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112045579 + ... + 112046304.

Almost surely, 2^81345353529 is an apocalyptic number.

It is an amenable number.

81345353529 is a deficient number, since it is larger than the sum of its proper divisors (37871528759).

81345353529 is a wasteful number, since it uses less digits than its factorization.

81345353529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224091908 (or 224091897 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 48.

The spelling of 81345353529 in words is "eighty-one billion, three hundred forty-five million, three hundred fifty-three thousand, five hundred twenty-nine".