1669881633121 has 27 divisors (see below), whose sum is σ = 1827239051001. Its totient is φ = 1525379591424.

The previous prime is 1669881633083. The next prime is 1669881633151. The reversal of 1669881633121 is 1213361889661.

The square root of 1669881633121 is 1292239.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1237133430225 + 432748202896 = 1112265^2 + 657836^2 .

It is not a de Polignac number, because 1669881633121 - 2³³ = 1661291698529 is a prime.

It is a super-3 number, since 3×1669881633121³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1669881633151) 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 26 ways as a sum of consecutive naturals, for example, 1797503985 + ... + 1797504913.

Almost surely, 2^{1669881633121} is an apocalyptic number.

1669881633121 is the 1292239-th square number.

1669881633121 is the 646120-th centered octagonal number.

It is an amenable number.

1669881633121 is a deficient number, since it is larger than the sum of its proper divisors (157357417880).

1669881633121 is an frugal number, since it uses more digits than its factorization.

1669881633121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098 (or 1049 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The spelling of 1669881633121 in words is "one trillion, six hundred sixty-nine billion, eight hundred eighty-one million, six hundred thirty-three thousand, one hundred twenty-one".