985580359661 has 2 divisors, whose sum is σ = 985580359662. Its totient is φ = 985580359660.

The previous prime is 985580359651. The next prime is 985580359723. The reversal of 985580359661 is 166953085589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 928043222500 + 57537137161 = 963350^2 + 239869^2 .

It is an emirp because it is prime and its reverse (166953085589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985580359661 - 2¹⁴ = 985580343277 is a prime.

It is a super-2 number, since 2×985580359661² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985580359651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492790179830 + 492790179831.

It is an arithmetic number, because the mean of its divisors is an integer number (492790179831).

Almost surely, 2^985580359661 is an apocalyptic number.

It is an amenable number.

985580359661 is a deficient number, since it is larger than the sum of its proper divisors (1).

985580359661 is an equidigital number, since it uses as much as digits as its factorization.

985580359661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984000, while the sum is 65.

The spelling of 985580359661 in words is "nine hundred eighty-five billion, five hundred eighty million, three hundred fifty-nine thousand, six hundred sixty-one".