71786181993 has 4 divisors (see below), whose sum is σ = 95714909328. Its totient is φ = 47857454660.

The previous prime is 71786181899. The next prime is 71786182001. The reversal of 71786181993 is 39918168717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71786181993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71786181193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11964363663 + ... + 11964363668.

It is an arithmetic number, because the mean of its divisors is an integer number (23928727332).

Almost surely, 2^71786181993 is an apocalyptic number.

It is an amenable number.

71786181993 is a deficient number, since it is larger than the sum of its proper divisors (23928727335).

71786181993 is a wasteful number, since it uses less digits than its factorization.

71786181993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23928727334.

The product of its digits is 4572288, while the sum is 60.

The spelling of 71786181993 in words is "seventy-one billion, seven hundred eighty-six million, one hundred eighty-one thousand, nine hundred ninety-three".