71551687213 has 2 divisors, whose sum is σ = 71551687214. Its totient is φ = 71551687212.

The previous prime is 71551687201. The next prime is 71551687271. The reversal of 71551687213 is 31278615517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57206115684 + 14345571529 = 239178^2 + 119773^2 .

It is a cyclic number.

It is not a de Polignac number, because 71551687213 - 2³³ = 62961752621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71551687513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35775843606 + 35775843607.

It is an arithmetic number, because the mean of its divisors is an integer number (35775843607).

Almost surely, 2^71551687213 is an apocalyptic number.

It is an amenable number.

71551687213 is a deficient number, since it is larger than the sum of its proper divisors (1).

71551687213 is an equidigital number, since it uses as much as digits as its factorization.

71551687213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 46.

The spelling of 71551687213 in words is "seventy-one billion, five hundred fifty-one million, six hundred eighty-seven thousand, two hundred thirteen".