71916830257 has 2 divisors, whose sum is σ = 71916830258. Its totient is φ = 71916830256.

The previous prime is 71916830203. The next prime is 71916830267. The reversal of 71916830257 is 75203861917.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58107995136 + 13808835121 = 241056^2 + 117511^2 .

It is a cyclic number.

It is not a de Polignac number, because 71916830257 - 2³¹ = 69769346609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71916830257.

It is not a weakly prime, because it can be changed into another prime (71916830267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35958415128 + 35958415129.

It is an arithmetic number, because the mean of its divisors is an integer number (35958415129).

Almost surely, 2^71916830257 is an apocalyptic number.

It is an amenable number.

71916830257 is a deficient number, since it is larger than the sum of its proper divisors (1).

71916830257 is an equidigital number, since it uses as much as digits as its factorization.

71916830257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 71916830257 in words is "seventy-one billion, nine hundred sixteen million, eight hundred thirty thousand, two hundred fifty-seven".