81254407575 has 24 divisors (see below), whose sum is σ = 146553405696. Its totient is φ = 39396076000.

The previous prime is 81254407571. The next prime is 81254407589. The reversal of 81254407575 is 57570445218.

It is not a de Polignac number, because 81254407575 - 2² = 81254407571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81254407571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49244271 + ... + 49245920.

It is an arithmetic number, because the mean of its divisors is an integer number (6106391904).

Almost surely, 2^81254407575 is an apocalyptic number.

81254407575 is a deficient number, since it is larger than the sum of its proper divisors (65298998121).

81254407575 is a wasteful number, since it uses less digits than its factorization.

81254407575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98490215 (or 98490210 counting only the distinct ones).

The product of its (nonzero) digits is 1568000, while the sum is 48.

The spelling of 81254407575 in words is "eighty-one billion, two hundred fifty-four million, four hundred seven thousand, five hundred seventy-five".