71133690681 has 9 divisors (see below), whose sum is σ = 102749820069. Its totient is φ = 47421927036.

The previous prime is 71133690659. The next prime is 71133690689. The reversal of 71133690681 is 18609633117.

The square root of 71133690681 is 266709.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 71133690681 - 2⁹ = 71133690169 is a prime.

It is a super-2 number, since 2×71133690681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71133690689) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 755676 + ... + 844578.

Almost surely, 2^71133690681 is an apocalyptic number.

71133690681 is the 266709-th square number.

71133690681 is the 133355-th centered octagonal number.

It is an amenable number.

71133690681 is a deficient number, since it is larger than the sum of its proper divisors (31616129388).

71133690681 is an frugal number, since it uses more digits than its factorization.

71133690681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177812 (or 88906 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 71133690681 in words is "seventy-one billion, one hundred thirty-three million, six hundred ninety thousand, six hundred eighty-one".