71247771653 has 2 divisors, whose sum is σ = 71247771654. Its totient is φ = 71247771652.

The previous prime is 71247771601. The next prime is 71247771697. The reversal of 71247771653 is 35617774217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66150811204 + 5096960449 = 257198^2 + 71393^2 .

It is a cyclic number.

It is not a de Polignac number, because 71247771653 - 2³² = 66952804357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71247771253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35623885826 + 35623885827.

It is an arithmetic number, because the mean of its divisors is an integer number (35623885827).

Almost surely, 2^71247771653 is an apocalyptic number.

It is an amenable number.

71247771653 is a deficient number, since it is larger than the sum of its proper divisors (1).

71247771653 is an equidigital number, since it uses as much as digits as its factorization.

71247771653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728720, while the sum is 50.

It can be divided in two parts, 7124 and 7771653, that added together give a palindrome (7778777).

The spelling of 71247771653 in words is "seventy-one billion, two hundred forty-seven million, seven hundred seventy-one thousand, six hundred fifty-three".