71381342561 has 16 divisors (see below), whose sum is σ = 72529262400. Its totient is φ = 70243407360.

The previous prime is 71381342521. The next prime is 71381342567. The reversal of 71381342561 is 16524318317.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71381342561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71381342567) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 31292741 + ... + 31295021.

It is an arithmetic number, because the mean of its divisors is an integer number (4533078900).

Almost surely, 2^71381342561 is an apocalyptic number.

It is an amenable number.

71381342561 is a deficient number, since it is larger than the sum of its proper divisors (1147919839).

71381342561 is a wasteful number, since it uses less digits than its factorization.

71381342561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256.

The product of its digits is 120960, while the sum is 41.

The spelling of 71381342561 in words is "seventy-one billion, three hundred eighty-one million, three hundred forty-two thousand, five hundred sixty-one".