81446460127 has 2 divisors, whose sum is σ = 81446460128. Its totient is φ = 81446460126.

The previous prime is 81446460119. The next prime is 81446460209. The reversal of 81446460127 is 72106464418.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81446460127 - 2³ = 81446460119 is a prime.

It is a super-2 number, since 2×81446460127² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81446460727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40723230063 + 40723230064.

It is an arithmetic number, because the mean of its divisors is an integer number (40723230064).

Almost surely, 2^81446460127 is an apocalyptic number.

81446460127 is a deficient number, since it is larger than the sum of its proper divisors (1).

81446460127 is an equidigital number, since it uses as much as digits as its factorization.

81446460127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 81446460127 in words is "eighty-one billion, four hundred forty-six million, four hundred sixty thousand, one hundred twenty-seven".