81612263807 has 2 divisors, whose sum is σ = 81612263808. Its totient is φ = 81612263806.

The previous prime is 81612263753. The next prime is 81612263827. The reversal of 81612263807 is 70836221618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81612263807 - 2²² = 81608069503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81612263827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40806131903 + 40806131904.

It is an arithmetic number, because the mean of its divisors is an integer number (40806131904).

Almost surely, 2^81612263807 is an apocalyptic number.

81612263807 is a deficient number, since it is larger than the sum of its proper divisors (1).

81612263807 is an equidigital number, since it uses as much as digits as its factorization.

81612263807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 81612263807 in words is "eighty-one billion, six hundred twelve million, two hundred sixty-three thousand, eight hundred seven".