71561375609 has 4 divisors (see below), whose sum is σ = 71790006516. Its totient is φ = 71332744704.

The previous prime is 71561375593. The next prime is 71561375617. The reversal of 71561375609 is 90657316517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90657316517 = 397 ⋅228355961.

It can be written as a sum of positive squares in 2 ways, for example, as 35194885609 + 36366490000 = 187603^2 + 190700^2 .

It is a cyclic number.

It is not a de Polignac number, because 71561375609 - 2⁴ = 71561375593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71561372609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114314984 + ... + 114315609.

It is an arithmetic number, because the mean of its divisors is an integer number (17947501629).

Almost surely, 2^71561375609 is an apocalyptic number.

It is an amenable number.

71561375609 is a deficient number, since it is larger than the sum of its proper divisors (228630907).

71561375609 is a wasteful number, since it uses less digits than its factorization.

71561375609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228630906.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 71561375609 in words is "seventy-one billion, five hundred sixty-one million, three hundred seventy-five thousand, six hundred nine".