71607814561 has 4 divisors (see below), whose sum is σ = 71608356400. Its totient is φ = 71607272724.

The previous prime is 71607814549. The next prime is 71607814567. The reversal of 71607814561 is 16541870617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 71607814561 - 2⁷ = 71607814433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71607814567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72010 + ... + 385228.

It is an arithmetic number, because the mean of its divisors is an integer number (17902089100).

Almost surely, 2^71607814561 is an apocalyptic number.

It is an amenable number.

71607814561 is a deficient number, since it is larger than the sum of its proper divisors (541839).

71607814561 is a wasteful number, since it uses less digits than its factorization.

71607814561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541838.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 71607814561 in words is "seventy-one billion, six hundred seven million, eight hundred fourteen thousand, five hundred sixty-one".