81325093500 has 480 divisors, whose sum is σ = 311463664512. Its totient is φ = 18083865600.

The previous prime is 81325093489. The next prime is 81325093523. The reversal of 81325093500 is 539052318.

81325093500 is a `hidden beast` number, since 8 + 13 + 2 + 50 + 93 + 500 = 666.

It is a super-2 number, since 2×81325093500² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 10485624 + ... + 10493376.

Almost surely, 2^81325093500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81325093500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155731832256).

81325093500 is an abundant number, since it is smaller than the sum of its proper divisors (230138571012).

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

81325093500 is a wasteful number, since it uses less digits than its factorization.

81325093500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7828 (or 7807 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 81325093500 in words is "eighty-one billion, three hundred twenty-five million, ninety-three thousand, five hundred".