71257075565 has 16 divisors (see below), whose sum is σ = 92109150000. Its totient is φ = 52607419392.

The previous prime is 71257075553. The next prime is 71257075567. The reversal of 71257075565 is 56557075217.

It can be written as a sum of positive squares in 8 ways, for example, as 23112816841 + 48144258724 = 152029^2 + 219418^2 .

It is a cyclic number.

It is not a de Polignac number, because 71257075565 - 2³⁰ = 70183333741 is a prime.

It is a super-2 number, since 2×71257075565² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71257075567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127811 + ... + 398559.

It is an arithmetic number, because the mean of its divisors is an integer number (5756821875).

Almost surely, 2^71257075565 is an apocalyptic number.

It is an amenable number.

71257075565 is a deficient number, since it is larger than the sum of its proper divisors (20852074435).

71257075565 is a wasteful number, since it uses less digits than its factorization.

71257075565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274816.

The product of its (nonzero) digits is 2572500, while the sum is 50.

The spelling of 71257075565 in words is "seventy-one billion, two hundred fifty-seven million, seventy-five thousand, five hundred sixty-five".