1398561666369 has 32 divisors (see below), whose sum is σ = 2161300838400. Its totient is φ = 787869868800.

The previous prime is 1398561666329. The next prime is 1398561666503. The reversal of 1398561666369 is 9636661658931.

It is not a de Polignac number, because 1398561666369 - 2¹¹ = 1398561664321 is a prime.

It is a super-2 number, since 2×1398561666369² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1398561666329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38510782 + ... + 38547080.

It is an arithmetic number, because the mean of its divisors is an integer number (67540651200).

Almost surely, 2^{1398561666369} is an apocalyptic number.

It is an amenable number.

1398561666369 is a deficient number, since it is larger than the sum of its proper divisors (762739172031).

1398561666369 is a wasteful number, since it uses less digits than its factorization.

1398561666369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62221.

The product of its digits is 226748160, while the sum is 69.

The spelling of 1398561666369 in words is "one trillion, three hundred ninety-eight billion, five hundred sixty-one million, six hundred sixty-six thousand, three hundred sixty-nine".