71947788591 has 16 divisors (see below), whose sum is σ = 110866579200. Its totient is φ = 40651076928.

The previous prime is 71947788553. The next prime is 71947788683. The reversal of 71947788591 is 19588774917.

It is not a de Polignac number, because 71947788591 - 2⁹ = 71947788079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71947788191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19245801 + ... + 19249538.

It is an arithmetic number, because the mean of its divisors is an integer number (6929161200).

Almost surely, 2^71947788591 is an apocalyptic number.

71947788591 is a deficient number, since it is larger than the sum of its proper divisors (38918790609).

71947788591 is a wasteful number, since it uses less digits than its factorization.

71947788591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38495438.

The product of its digits is 35562240, while the sum is 66.

The spelling of 71947788591 in words is "seventy-one billion, nine hundred forty-seven million, seven hundred eighty-eight thousand, five hundred ninety-one".