81623126548463 has 2 divisors, whose sum is σ = 81623126548464. Its totient is φ = 81623126548462.

The previous prime is 81623126548433. The next prime is 81623126548573. The reversal of 81623126548463 is 36484562132618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81623126548463 - 2¹⁸ = 81623126286319 is a prime.

It is a super-2 number, since 2×81623126548463² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81623126548433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40811563274231 + 40811563274232.

It is an arithmetic number, because the mean of its divisors is an integer number (40811563274232).

Almost surely, 2^{81623126548463} is an apocalyptic number.

81623126548463 is a deficient number, since it is larger than the sum of its proper divisors (1).

81623126548463 is an equidigital number, since it uses as much as digits as its factorization.

81623126548463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39813120, while the sum is 59.

The spelling of 81623126548463 in words is "eighty-one trillion, six hundred twenty-three billion, one hundred twenty-six million, five hundred forty-eight thousand, four hundred sixty-three".