81324397548 has 30 divisors (see below), whose sum is σ = 212598040116. Its totient is φ = 27108132408.

The previous prime is 81324397543. The next prime is 81324397571. The reversal of 81324397548 is 84579342318.

It is a happy number.

81324397548 is a `hidden beast` number, since 8 + 1 + 3 + 2 + 4 + 3 + 97 + 548 = 666.

It is a super-2 number, since 2×81324397548² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 81324397494 and 81324397503.

It is not an unprimeable number, because it can be changed into a prime (81324397541) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 125500290 + ... + 125500937.

Almost surely, 2^81324397548 is an apocalyptic number.

It is an amenable number.

81324397548 is an abundant number, since it is smaller than the sum of its proper divisors (131273642568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81324397548 is a wasteful number, since it uses less digits than its factorization.

81324397548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251001243 (or 251001232 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 81324397548 in words is "eighty-one billion, three hundred twenty-four million, three hundred ninety-seven thousand, five hundred forty-eight".