71939569725 has 36 divisors (see below), whose sum is σ = 128959534132. Its totient is φ = 38335680000.

The previous prime is 71939569703. The next prime is 71939569727. The reversal of 71939569725 is 52796593917.

71939569725 is a `hidden beast` number, since 7 + 19 + 39 + 569 + 7 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 3091582404 + 68847987321 = 55602^2 + 262389^2 .

It is not a de Polignac number, because 71939569725 - 2⁸ = 71939569469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71939569727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 137115 + ... + 403335.

Almost surely, 2^71939569725 is an apocalyptic number.

71939569725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71939569725 is a deficient number, since it is larger than the sum of its proper divisors (57019964407).

71939569725 is a wasteful number, since it uses less digits than its factorization.

71939569725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267438 (or 267430 counting only the distinct ones).

The product of its digits is 32148900, while the sum is 63.

The spelling of 71939569725 in words is "seventy-one billion, nine hundred thirty-nine million, five hundred sixty-nine thousand, seven hundred twenty-five".