81538147267 has 2 divisors, whose sum is σ = 81538147268. Its totient is φ = 81538147266.

The previous prime is 81538147219. The next prime is 81538147333. The reversal of 81538147267 is 76274183518.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81538147267 is a prime.

It is not a weakly prime, because it can be changed into another prime (81538147367) 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, 40769073633 + 40769073634.

It is an arithmetic number, because the mean of its divisors is an integer number (40769073634).

Almost surely, 2^81538147267 is an apocalyptic number.

81538147267 is a deficient number, since it is larger than the sum of its proper divisors (1).

81538147267 is an equidigital number, since it uses as much as digits as its factorization.

81538147267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 52.

The spelling of 81538147267 in words is "eighty-one billion, five hundred thirty-eight million, one hundred forty-seven thousand, two hundred sixty-seven".