81470118681722 has 16 divisors (see below), whose sum is σ = 125797877581992. Its totient is φ = 39542578030080.

The previous prime is 81470118681719. The next prime is 81470118681739. The reversal of 81470118681722 is 22718681107418.

It can be written as a sum of positive squares in 4 ways, for example, as 79076751885121 + 2393366796601 = 8892511^2 + 1547051^2 .

It is a super-2 number, since 2×81470118681722² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271269979 + ... + 1271334062.

Almost surely, 2^{81470118681722} is an apocalyptic number.

81470118681722 is a deficient number, since it is larger than the sum of its proper divisors (44327758900270).

81470118681722 is a wasteful number, since it uses less digits than its factorization.

81470118681722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542604513.

The product of its (nonzero) digits is 2408448, while the sum is 56.

The spelling of 81470118681722 in words is "eighty-one trillion, four hundred seventy billion, one hundred eighteen million, six hundred eighty-one thousand, seven hundred twenty-two".