1620417236189 has 2 divisors, whose sum is σ = 1620417236190. Its totient is φ = 1620417236188.

The previous prime is 1620417236147. The next prime is 1620417236203. The reversal of 1620417236189 is 9816327140261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1017138812089 + 603278424100 = 1008533^2 + 776710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620417236189 - 2¹⁶ = 1620417170653 is a prime.

It is a super-2 number, since 2×1620417236189² (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 (1620417233189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810208618094 + 810208618095.

It is an arithmetic number, because the mean of its divisors is an integer number (810208618095).

Almost surely, 2^{1620417236189} is an apocalyptic number.

It is an amenable number.

1620417236189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620417236189 is an equidigital number, since it uses as much as digits as its factorization.

1620417236189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 1620417236189 in words is "one trillion, six hundred twenty billion, four hundred seventeen million, two hundred thirty-six thousand, one hundred eighty-nine".