1997594969769 has 243 divisors, whose sum is σ = 3699097633413. Its totient is φ = 1035531495936.

The previous prime is 1997594969767. The next prime is 1997594969779. The reversal of 1997594969769 is 9679694957991.

The square root of 1997594969769 is 1413363.

It is a perfect power (a square), and thus also a powerful number.

1997594969769 is a `hidden beast` number, since 1 + 9 + 9 + 7 + 59 + 496 + 9 + 7 + 69 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 929224665369 + 1068370304400 = 963963^2 + 1033620^2 .

It is not a de Polignac number, because 1997594969769 - 2¹ = 1997594969767 is a prime.

It is a super-2 number, since 2×1997594969769² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1997594969767) 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 in 242 ways as a sum of consecutive naturals, for example, 18669111814 + ... + 18669111920.

Almost surely, 2^{1997594969769} is an apocalyptic number.

1997594969769 is the 1413363-rd square number.

1997594969769 is the 706682-nd centered octagonal number.

It is an amenable number.

1997594969769 is a deficient number, since it is larger than the sum of its proper divisors (1701502663644).

1997594969769 is a wasteful number, since it uses less digits than its factorization.

1997594969769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 171 counting only the distinct ones).

The product of its digits is 18749238480, while the sum is 90.

The spelling of 1997594969769 in words is "one trillion, nine hundred ninety-seven billion, five hundred ninety-four million, nine hundred sixty-nine thousand, seven hundred sixty-nine".