81066800154463 has 2 divisors, whose sum is σ = 81066800154464. Its totient is φ = 81066800154462.

The previous prime is 81066800154371. The next prime is 81066800154511. The reversal of 81066800154463 is 36445100866018.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81066800154463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81066800154463.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81066800152463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40533400077231 + 40533400077232.

It is an arithmetic number, because the mean of its divisors is an integer number (40533400077232).

Almost surely, 2^{81066800154463} is an apocalyptic number.

81066800154463 is a deficient number, since it is larger than the sum of its proper divisors (1).

81066800154463 is an equidigital number, since it uses as much as digits as its factorization.

81066800154463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 81066800154463 in words is "eighty-one trillion, sixty-six billion, eight hundred million, one hundred fifty-four thousand, four hundred sixty-three".