71808616751 has 2 divisors, whose sum is σ = 71808616752. Its totient is φ = 71808616750.

The previous prime is 71808616727. The next prime is 71808616769. The reversal of 71808616751 is 15761680817.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71808616751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71808616751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71808616351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35904308375 + 35904308376.

It is an arithmetic number, because the mean of its divisors is an integer number (35904308376).

Almost surely, 2^71808616751 is an apocalyptic number.

71808616751 is a deficient number, since it is larger than the sum of its proper divisors (1).

71808616751 is an equidigital number, since it uses as much as digits as its factorization.

71808616751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 71808616751 in words is "seventy-one billion, eight hundred eight million, six hundred sixteen thousand, seven hundred fifty-one".