81732211871 has 2 divisors, whose sum is σ = 81732211872. Its totient is φ = 81732211870.

The previous prime is 81732211861. The next prime is 81732211877. The reversal of 81732211871 is 17811223718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81732211871 - 2⁶ = 81732211807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81732211877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866105935 + 40866105936.

It is an arithmetic number, because the mean of its divisors is an integer number (40866105936).

Almost surely, 2^81732211871 is an apocalyptic number.

81732211871 is a deficient number, since it is larger than the sum of its proper divisors (1).

81732211871 is an equidigital number, since it uses as much as digits as its factorization.

81732211871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 41.

The spelling of 81732211871 in words is "eighty-one billion, seven hundred thirty-two million, two hundred eleven thousand, eight hundred seventy-one".