985640447170321 has 2 divisors, whose sum is σ = 985640447170322. Its totient is φ = 985640447170320.

The previous prime is 985640447170277. The next prime is 985640447170331. The reversal of 985640447170321 is 123071744046589.

It is a happy number.

985640447170321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745304414469696 + 240336032700625 = 27300264^2 + 15502775^2 .

It is a cyclic number.

It is not a de Polignac number, because 985640447170321 - 2²¹ = 985640445073169 is a prime.

It is a super-2 number, since 2×985640447170321² (a number of 31 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 985640447170321.

It is not a weakly prime, because it can be changed into another prime (985640447170331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492820223585160 + 492820223585161.

It is an arithmetic number, because the mean of its divisors is an integer number (492820223585161).

It is a 1-persistent number, because it is pandigital, but 2⋅985640447170321 = 1971280894340642 is not.

Almost surely, 2^{985640447170321} is an apocalyptic number.

It is an amenable number.

985640447170321 is a deficient number, since it is larger than the sum of its proper divisors (1).

985640447170321 is an equidigital number, since it uses as much as digits as its factorization.

985640447170321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 985640447170321 in words is "nine hundred eighty-five trillion, six hundred forty billion, four hundred forty-seven million, one hundred seventy thousand, three hundred twenty-one".