81069257267 has 2 divisors, whose sum is σ = 81069257268. Its totient is φ = 81069257266.

The previous prime is 81069257251. The next prime is 81069257327. The reversal of 81069257267 is 76275296018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81069257267 - 2⁴ = 81069257251 is a prime.

It is not a weakly prime, because it can be changed into another prime (81069257767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40534628633 + 40534628634.

It is an arithmetic number, because the mean of its divisors is an integer number (40534628634).

Almost surely, 2^81069257267 is an apocalyptic number.

81069257267 is a deficient number, since it is larger than the sum of its proper divisors (1).

81069257267 is an equidigital number, since it uses as much as digits as its factorization.

81069257267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 81069257267 in words is "eighty-one billion, sixty-nine million, two hundred fifty-seven thousand, two hundred sixty-seven".