81470118681719 has 2 divisors, whose sum is σ = 81470118681720. Its totient is φ = 81470118681718.

The previous prime is 81470118681713. The next prime is 81470118681739. The reversal of 81470118681719 is 91718681107418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81470118681719 - 2²⁰ = 81470117633143 is a prime.

It is a super-2 number, since 2×81470118681719² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81470118681713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40735059340859 + 40735059340860.

It is an arithmetic number, because the mean of its divisors is an integer number (40735059340860).

Almost surely, 2^{81470118681719} is an apocalyptic number.

81470118681719 is a deficient number, since it is larger than the sum of its proper divisors (1).

81470118681719 is an equidigital number, since it uses as much as digits as its factorization.

81470118681719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5419008, while the sum is 62.

The spelling of 81470118681719 in words is "eighty-one trillion, four hundred seventy billion, one hundred eighteen million, six hundred eighty-one thousand, seven hundred nineteen".