71709000661 has 2 divisors, whose sum is σ = 71709000662. Its totient is φ = 71709000660.

The previous prime is 71709000647. The next prime is 71709000673. The reversal of 71709000661 is 16600090717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64429668900 + 7279331761 = 253830^2 + 85319^2 .

It is a cyclic number.

It is not a de Polignac number, because 71709000661 - 2¹⁵ = 71708967893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71709000661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71709000641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35854500330 + 35854500331.

It is an arithmetic number, because the mean of its divisors is an integer number (35854500331).

Almost surely, 2^71709000661 is an apocalyptic number.

It is an amenable number.

71709000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71709000661 is an equidigital number, since it uses as much as digits as its factorization.

71709000661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The spelling of 71709000661 in words is "seventy-one billion, seven hundred nine million, six hundred sixty-one", and thus it is an aban number.