81425144587 has 2 divisors, whose sum is σ = 81425144588. Its totient is φ = 81425144586.

The previous prime is 81425144551. The next prime is 81425144611. The reversal of 81425144587 is 78544152418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81425144587 - 2³¹ = 79277660939 is a prime.

It is a super-3 number, since 3×81425144587³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81425144587.

It is not a weakly prime, because it can be changed into another prime (81425144527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40712572293 + 40712572294.

It is an arithmetic number, because the mean of its divisors is an integer number (40712572294).

Almost surely, 2^81425144587 is an apocalyptic number.

81425144587 is a deficient number, since it is larger than the sum of its proper divisors (1).

81425144587 is an equidigital number, since it uses as much as digits as its factorization.

81425144587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1433600, while the sum is 49.

The spelling of 81425144587 in words is "eighty-one billion, four hundred twenty-five million, one hundred forty-four thousand, five hundred eighty-seven".