81012593507 has 2 divisors, whose sum is σ = 81012593508. Its totient is φ = 81012593506.

The previous prime is 81012593411. The next prime is 81012593531. The reversal of 81012593507 is 70539521018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81012593507 - 2¹⁸ = 81012331363 is a prime.

It is not a weakly prime, because it can be changed into another prime (81012593567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40506296753 + 40506296754.

It is an arithmetic number, because the mean of its divisors is an integer number (40506296754).

Almost surely, 2^81012593507 is an apocalyptic number.

81012593507 is a deficient number, since it is larger than the sum of its proper divisors (1).

81012593507 is an equidigital number, since it uses as much as digits as its factorization.

81012593507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 81012593507 in words is "eighty-one billion, twelve million, five hundred ninety-three thousand, five hundred seven".