81525134375 has 12 divisors (see below), whose sum is σ = 101899899864. Its totient is φ = 65220105000.

The previous prime is 81525134371. The next prime is 81525134381. The reversal of 81525134375 is 57343152518.

It is not a de Polignac number, because 81525134375 - 2² = 81525134371 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 (81525134371) 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, 13040897 + ... + 13047146.

It is an arithmetic number, because the mean of its divisors is an integer number (8491658322).

Almost surely, 2^81525134375 is an apocalyptic number.

81525134375 is a deficient number, since it is larger than the sum of its proper divisors (20374765489).

81525134375 is an frugal number, since it uses more digits than its factorization.

81525134375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26088068 (or 26088048 counting only the distinct ones).

The product of its digits is 504000, while the sum is 44.

The spelling of 81525134375 in words is "eighty-one billion, five hundred twenty-five million, one hundred thirty-four thousand, three hundred seventy-five".