81284523855883 has 2 divisors, whose sum is σ = 81284523855884. Its totient is φ = 81284523855882.

The previous prime is 81284523855859. The next prime is 81284523855901. The reversal of 81284523855883 is 38855832548218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81284523855883 - 2²¹ = 81284521758731 is a prime.

It is a super-2 number, since 2×81284523855883² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81284523855833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40642261927941 + 40642261927942.

It is an arithmetic number, because the mean of its divisors is an integer number (40642261927942).

Almost surely, 2^{81284523855883} is an apocalyptic number.

81284523855883 is a deficient number, since it is larger than the sum of its proper divisors (1).

81284523855883 is an equidigital number, since it uses as much as digits as its factorization.

81284523855883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 589824000, while the sum is 70.

The spelling of 81284523855883 in words is "eighty-one trillion, two hundred eighty-four billion, five hundred twenty-three million, eight hundred fifty-five thousand, eight hundred eighty-three".