1645179347989 has 2 divisors, whose sum is σ = 1645179347990. Its totient is φ = 1645179347988.

The previous prime is 1645179347921. The next prime is 1645179348013. The reversal of 1645179347989 is 9897439715461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1136750454225 + 508428893764 = 1066185^2 + 713042^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645179347989 - 2⁹ = 1645179347477 is a prime.

It is a super-2 number, since 2×1645179347989² (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 (1645179347489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822589673994 + 822589673995.

It is an arithmetic number, because the mean of its divisors is an integer number (822589673995).

Almost surely, 2^{1645179347989} is an apocalyptic number.

It is an amenable number.

1645179347989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645179347989 is an equidigital number, since it uses as much as digits as its factorization.

1645179347989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 411505920, while the sum is 73.

The spelling of 1645179347989 in words is "one trillion, six hundred forty-five billion, one hundred seventy-nine million, three hundred forty-seven thousand, nine hundred eighty-nine".