71907072661 has 2 divisors, whose sum is σ = 71907072662. Its totient is φ = 71907072660.

The previous prime is 71907072631. The next prime is 71907072683. The reversal of 71907072661 is 16627070917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57939378436 + 13967694225 = 240706^2 + 118185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71907072661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71907072631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35953536330 + 35953536331.

It is an arithmetic number, because the mean of its divisors is an integer number (35953536331).

Almost surely, 2^71907072661 is an apocalyptic number.

It is an amenable number.

71907072661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71907072661 is an equidigital number, since it uses as much as digits as its factorization.

71907072661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 46.

The spelling of 71907072661 in words is "seventy-one billion, nine hundred seven million, seventy-two thousand, six hundred sixty-one".