71637652909 has 2 divisors, whose sum is σ = 71637652910. Its totient is φ = 71637652908.

The previous prime is 71637652883. The next prime is 71637652927. The reversal of 71637652909 is 90925673617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50750177284 + 20887475625 = 225278^2 + 144525^2 .

It is a cyclic number.

It is not a de Polignac number, because 71637652909 - 2¹⁵ = 71637620141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71637652909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71637652109) 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, 35818826454 + 35818826455.

It is an arithmetic number, because the mean of its divisors is an integer number (35818826455).

Almost surely, 2^71637652909 is an apocalyptic number.

It is an amenable number.

71637652909 is a deficient number, since it is larger than the sum of its proper divisors (1).

71637652909 is an equidigital number, since it uses as much as digits as its factorization.

71637652909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4286520, while the sum is 55.

The spelling of 71637652909 in words is "seventy-one billion, six hundred thirty-seven million, six hundred fifty-two thousand, nine hundred nine".