81355025267 has 2 divisors, whose sum is σ = 81355025268. Its totient is φ = 81355025266.

The previous prime is 81355025239. The next prime is 81355025369. The reversal of 81355025267 is 76252055318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81355025267 - 2⁶ = 81355025203 is a prime.

It is not a weakly prime, because it can be changed into another prime (81355015267) 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, 40677512633 + 40677512634.

It is an arithmetic number, because the mean of its divisors is an integer number (40677512634).

Almost surely, 2^81355025267 is an apocalyptic number.

81355025267 is a deficient number, since it is larger than the sum of its proper divisors (1).

81355025267 is an equidigital number, since it uses as much as digits as its factorization.

81355025267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 81355025267 in words is "eighty-one billion, three hundred fifty-five million, twenty-five thousand, two hundred sixty-seven".