81845094025 has 24 divisors (see below), whose sum is σ = 102066726240. Its totient is φ = 65103404160.

The previous prime is 81845093977. The next prime is 81845094043. The reversal of 81845094025 is 52049054818.

It is not a de Polignac number, because 81845094025 - 2²⁷ = 81710876297 is a prime.

It is a super-2 number, since 2×81845094025² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4582162 + ... + 4599988.

It is an arithmetic number, because the mean of its divisors is an integer number (4252780260).

Almost surely, 2^81845094025 is an apocalyptic number.

It is an amenable number.

81845094025 is a deficient number, since it is larger than the sum of its proper divisors (20221632215).

81845094025 is a wasteful number, since it uses less digits than its factorization.

81845094025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18873 (or 18868 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 81845094025 in words is "eighty-one billion, eight hundred forty-five million, ninety-four thousand, twenty-five".