81433075025 has 12 divisors (see below), whose sum is σ = 101037638832. Its totient is φ = 65107346640.

The previous prime is 81433074991. The next prime is 81433075027. The reversal of 81433075025 is 52057033418.

It is not a de Polignac number, because 81433075025 - 2²⁶ = 81365966161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81433075025.

It is not an unprimeable number, because it can be changed into a prime (81433075027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 935327 + ... + 1018676.

It is an arithmetic number, because the mean of its divisors is an integer number (8419803236).

Almost surely, 2^81433075025 is an apocalyptic number.

It is an amenable number.

81433075025 is a deficient number, since it is larger than the sum of its proper divisors (19604563807).

81433075025 is a wasteful number, since it uses less digits than its factorization.

81433075025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955680 (or 1955675 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 81433075025 in words is "eighty-one billion, four hundred thirty-three million, seventy-five thousand, twenty-five".