71571528261 has 8 divisors (see below), whose sum is σ = 106031893760. Its totient is φ = 47714352156.

The previous prime is 71571528251. The next prime is 71571528319. The reversal of 71571528261 is 16282517517.

71571528261 is a `hidden beast` number, since 7 + 1 + 571 + 52 + 8 + 26 + 1 = 666.

It is not a de Polignac number, because 71571528261 - 2¹⁷ = 71571397189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71571528221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325398645 + ... + 1325398698.

It is an arithmetic number, because the mean of its divisors is an integer number (13253986720).

Almost surely, 2^71571528261 is an apocalyptic number.

It is an amenable number.

71571528261 is a deficient number, since it is larger than the sum of its proper divisors (34460365499).

71571528261 is a wasteful number, since it uses less digits than its factorization.

71571528261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650797352 (or 2650797346 counting only the distinct ones).

The product of its digits is 235200, while the sum is 45.

The spelling of 71571528261 in words is "seventy-one billion, five hundred seventy-one million, five hundred twenty-eight thousand, two hundred sixty-one".