1645393432369 has 2 divisors, whose sum is σ = 1645393432370. Its totient is φ = 1645393432368.

The previous prime is 1645393432301. The next prime is 1645393432381. The reversal of 1645393432369 is 9632343935461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1523526113344 + 121867319025 = 1234312^2 + 349095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645393432369 - 2²³ = 1645385043761 is a prime.

It is a super-2 number, since 2×1645393432369² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1645393432169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822696716184 + 822696716185.

It is an arithmetic number, because the mean of its divisors is an integer number (822696716185).

Almost surely, 2^{1645393432369} is an apocalyptic number.

It is an amenable number.

1645393432369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645393432369 is an equidigital number, since it uses as much as digits as its factorization.

1645393432369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37791360, while the sum is 58.

The spelling of 1645393432369 in words is "one trillion, six hundred forty-five billion, three hundred ninety-three million, four hundred thirty-two thousand, three hundred sixty-nine".