71542320425 has 24 divisors (see below), whose sum is σ = 90492826392. Its totient is φ = 56092032000.

The previous prime is 71542320391. The next prime is 71542320463. The reversal of 71542320425 is 52402324517.

It can be written as a sum of positive squares in 12 ways, for example, as 66657428761 + 4884891664 = 258181^2 + 69892^2 .

It is not a de Polignac number, because 71542320425 - 2³⁶ = 2822843689 is a prime.

It is a super-2 number, since 2×71542320425² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 337745 + ... + 507105.

It is an arithmetic number, because the mean of its divisors is an integer number (3770534433).

Almost surely, 2^71542320425 is an apocalyptic number.

It is an amenable number.

71542320425 is a deficient number, since it is larger than the sum of its proper divisors (18950505967).

71542320425 is a wasteful number, since it uses less digits than its factorization.

71542320425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169709 (or 169704 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

The spelling of 71542320425 in words is "seventy-one billion, five hundred forty-two million, three hundred twenty thousand, four hundred twenty-five".