71500078643 has 16 divisors (see below), whose sum is σ = 88361985024. Its totient is φ = 56453481600.

The previous prime is 71500078603. The next prime is 71500078669. The reversal of 71500078643 is 34687000517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71500078643 is a prime.

It is a super-2 number, since 2×71500078643² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71500078643.

It is not an unprimeable number, because it can be changed into a prime (71500078603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6386333 + ... + 6397518.

It is an arithmetic number, because the mean of its divisors is an integer number (5522624064).

Almost surely, 2^71500078643 is an apocalyptic number.

71500078643 is a deficient number, since it is larger than the sum of its proper divisors (16861906381).

71500078643 is a wasteful number, since it uses less digits than its factorization.

71500078643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12783922.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 71500078643 in words is "seventy-one billion, five hundred million, seventy-eight thousand, six hundred forty-three".