71638841811 has 32 divisors (see below), whose sum is σ = 101512609792. Its totient is φ = 44866392480.

The previous prime is 71638841801. The next prime is 71638841849. The reversal of 71638841811 is 11814883617.

It is not a de Polignac number, because 71638841811 - 2⁵ = 71638841779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71638841801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 596886 + ... + 706788.

It is an arithmetic number, because the mean of its divisors is an integer number (3172269056).

Almost surely, 2^71638841811 is an apocalyptic number.

71638841811 is a deficient number, since it is larger than the sum of its proper divisors (29873767981).

71638841811 is a wasteful number, since it uses less digits than its factorization.

71638841811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110143.

The product of its digits is 258048, while the sum is 48.

The spelling of 71638841811 in words is "seventy-one billion, six hundred thirty-eight million, eight hundred forty-one thousand, eight hundred eleven".