81272932804867 has 2 divisors, whose sum is σ = 81272932804868. Its totient is φ = 81272932804866.

The previous prime is 81272932804853. The next prime is 81272932804883. The reversal of 81272932804867 is 76840823927218.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81272932804867 is a prime.

It is not a weakly prime, because it can be changed into another prime (81272939804867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40636466402433 + 40636466402434.

It is an arithmetic number, because the mean of its divisors is an integer number (40636466402434).

Almost surely, 2^{81272932804867} is an apocalyptic number.

81272932804867 is a deficient number, since it is larger than the sum of its proper divisors (1).

81272932804867 is an equidigital number, since it uses as much as digits as its factorization.

81272932804867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 130056192, while the sum is 67.

The spelling of 81272932804867 in words is "eighty-one trillion, two hundred seventy-two billion, nine hundred thirty-two million, eight hundred four thousand, eight hundred sixty-seven".