81452700025 has 12 divisors (see below), whose sum is σ = 103731115372. Its totient is φ = 63401019840.

The previous prime is 81452700023. The next prime is 81452700031. The reversal of 81452700025 is 52000725418.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4575710736 + 76876989289 = 67644^2 + 277267^2 .

It is not a de Polignac number, because 81452700025 - 2¹ = 81452700023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81452700023) 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, 44027562 + ... + 44029411.

Almost surely, 2^81452700025 is an apocalyptic number.

It is an amenable number.

81452700025 is a deficient number, since it is larger than the sum of its proper divisors (22278415347).

81452700025 is a wasteful number, since it uses less digits than its factorization.

81452700025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88057020 (or 88057015 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The spelling of 81452700025 in words is "eighty-one billion, four hundred fifty-two million, seven hundred thousand, twenty-five".