81422641811 has 4 divisors (see below), whose sum is σ = 93054447792. Its totient is φ = 69790835832.

The previous prime is 81422641777. The next prime is 81422641831. The reversal of 81422641811 is 11814622418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11814622418 = 2 ⋅5907311209.

It is a cyclic number.

It is not a de Polignac number, because 81422641811 - 2⁶ = 81422641747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81422641831) 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, 5815902980 + ... + 5815902993.

It is an arithmetic number, because the mean of its divisors is an integer number (23263611948).

Almost surely, 2^81422641811 is an apocalyptic number.

81422641811 is a deficient number, since it is larger than the sum of its proper divisors (11631805981).

81422641811 is a wasteful number, since it uses less digits than its factorization.

81422641811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11631805980.

The product of its digits is 24576, while the sum is 38.

The spelling of 81422641811 in words is "eighty-one billion, four hundred twenty-two million, six hundred forty-one thousand, eight hundred eleven".