81881250179 has 2 divisors, whose sum is σ = 81881250180. Its totient is φ = 81881250178.

The previous prime is 81881250163. The next prime is 81881250229. The reversal of 81881250179 is 97105218818.

It is an a-pointer prime, because the next prime (81881250229) can be obtained adding 81881250179 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81881250179 - 2⁴ = 81881250163 is a prime.

It is not a weakly prime, because it can be changed into another prime (81881250109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40940625089 + 40940625090.

It is an arithmetic number, because the mean of its divisors is an integer number (40940625090).

Almost surely, 2^81881250179 is an apocalyptic number.

81881250179 is a deficient number, since it is larger than the sum of its proper divisors (1).

81881250179 is an equidigital number, since it uses as much as digits as its factorization.

81881250179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 50.

The spelling of 81881250179 in words is "eighty-one billion, eight hundred eighty-one million, two hundred fifty thousand, one hundred seventy-nine".