81940859467 has 2 divisors, whose sum is σ = 81940859468. Its totient is φ = 81940859466.

The previous prime is 81940859411. The next prime is 81940859543. The reversal of 81940859467 is 76495804918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81940859467 - 2¹¹ = 81940857419 is a prime.

It is not a weakly prime, because it can be changed into another prime (81940859267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40970429733 + 40970429734.

It is an arithmetic number, because the mean of its divisors is an integer number (40970429734).

Almost surely, 2^81940859467 is an apocalyptic number.

81940859467 is a deficient number, since it is larger than the sum of its proper divisors (1).

81940859467 is an equidigital number, since it uses as much as digits as its factorization.

81940859467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 81940859467 in words is "eighty-one billion, nine hundred forty million, eight hundred fifty-nine thousand, four hundred sixty-seven".