71311963850 has 24 divisors (see below), whose sum is σ = 132665154348. Its totient is φ = 28519430400.

The previous prime is 71311963843. The next prime is 71311963859. The reversal of 71311963850 is 5836911317.

It is a Cunningham number, because it is equal to 267043²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 40256008321 + 31055955529 = 200639^2 + 176227^2 .

It is not an unprimeable number, because it can be changed into a prime (71311963859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140690 + ... + 403010.

Almost surely, 2^71311963850 is an apocalyptic number.

71311963850 is a deficient number, since it is larger than the sum of its proper divisors (61353190498).

71311963850 is a wasteful number, since it uses less digits than its factorization.

71311963850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267770 (or 267765 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 71311963850 in words is "seventy-one billion, three hundred eleven million, nine hundred sixty-three thousand, eight hundred fifty".