1320220205861 has 2 divisors, whose sum is σ = 1320220205862. Its totient is φ = 1320220205860.

The previous prime is 1320220205839. The next prime is 1320220205911. The reversal of 1320220205861 is 1685020220231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 877687922500 + 442532283361 = 936850^2 + 665231^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320220205861 - 2¹⁰ = 1320220204837 is a prime.

It is a super-2 number, since 2×1320220205861² (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 (1320220205461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660110102930 + 660110102931.

It is an arithmetic number, because the mean of its divisors is an integer number (660110102931).

Almost surely, 2^{1320220205861} is an apocalyptic number.

It is an amenable number.

1320220205861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320220205861 is an equidigital number, since it uses as much as digits as its factorization.

1320220205861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 1320220205861 in words is "one trillion, three hundred twenty billion, two hundred twenty million, two hundred five thousand, eight hundred sixty-one".