71644941111 has 4 divisors (see below), whose sum is σ = 95526588152. Its totient is φ = 47763294072.

The previous prime is 71644941101. The next prime is 71644941113. The reversal of 71644941111 is 11114944617.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 71644941111 - 2⁶ = 71644941047 is a prime.

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 71644941111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71644941113) 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, 11940823516 + ... + 11940823521.

It is an arithmetic number, because the mean of its divisors is an integer number (23881647038).

Almost surely, 2^71644941111 is an apocalyptic number.

71644941111 is a deficient number, since it is larger than the sum of its proper divisors (23881647041).

71644941111 is a wasteful number, since it uses less digits than its factorization.

71644941111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23881647040.

The product of its digits is 24192, while the sum is 39.

The spelling of 71644941111 in words is "seventy-one billion, six hundred forty-four million, nine hundred forty-one thousand, one hundred eleven".