170359999981 has 2 divisors, whose sum is σ = 170359999982. Its totient is φ = 170359999980.

The previous prime is 170359999963. The next prime is 170360000017. The reversal of 170359999981 is 189999953071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125057005956 + 45302994025 = 353634^2 + 212845^2 .

It is a cyclic number.

It is not a de Polignac number, because 170359999981 - 2¹⁷ = 170359868909 is a prime.

It is a super-2 number, since 2×170359999981² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 170359999981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170359999921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85179999990 + 85179999991.

It is an arithmetic number, because the mean of its divisors is an integer number (85179999991).

Almost surely, 2^170359999981 is an apocalyptic number.

It is an amenable number.

170359999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

170359999981 is an equidigital number, since it uses as much as digits as its factorization.

170359999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49601160, while the sum is 70.

The spelling of 170359999981 in words is "one hundred seventy billion, three hundred fifty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".