1620145844089 has 2 divisors, whose sum is σ = 1620145844090. Its totient is φ = 1620145844088.

The previous prime is 1620145844047. The next prime is 1620145844099. The reversal of 1620145844089 is 9804485410261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978437505600 + 641708338489 = 989160^2 + 801067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620145844089 - 2⁷ = 1620145843961 is a prime.

It is a super-2 number, since 2×1620145844089² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1620145844099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810072922044 + 810072922045.

It is an arithmetic number, because the mean of its divisors is an integer number (810072922045).

Almost surely, 2^{1620145844089} is an apocalyptic number.

It is an amenable number.

1620145844089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620145844089 is an equidigital number, since it uses as much as digits as its factorization.

1620145844089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2211840, while the sum is 52.

The spelling of 1620145844089 in words is "one trillion, six hundred twenty billion, one hundred forty-five million, eight hundred forty-four thousand, eighty-nine".