71564712025 has 6 divisors (see below), whose sum is σ = 88740242942. Its totient is φ = 57251769600.

The previous prime is 71564712017. The next prime is 71564712041. The reversal of 71564712025 is 52021746517.

It can be written as a sum of positive squares in 3 ways, for example, as 801795856 + 70762916169 = 28316^2 + 266013^2 .

It is not a de Polignac number, because 71564712025 - 2³ = 71564712017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1431294216 + ... + 1431294265.

Almost surely, 2^71564712025 is an apocalyptic number.

It is an amenable number.

71564712025 is a deficient number, since it is larger than the sum of its proper divisors (17175530917).

71564712025 is a wasteful number, since it uses less digits than its factorization.

71564712025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862588491 (or 2862588486 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 71564712025 in words is "seventy-one billion, five hundred sixty-four million, seven hundred twelve thousand, twenty-five".