1669438374629 has 4 divisors (see below), whose sum is σ = 1670302028076. Its totient is φ = 1668574721184.

The previous prime is 1669438374563. The next prime is 1669438374673. The reversal of 1669438374629 is 9264738349661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 939057902500 + 730380472129 = 969050^2 + 854623^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669438374629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669498374629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431823824 + ... + 431827689.

It is an arithmetic number, because the mean of its divisors is an integer number (417575507019).

Almost surely, 2^{1669438374629} is an apocalyptic number.

It is an amenable number.

1669438374629 is a deficient number, since it is larger than the sum of its proper divisors (863653447).

1669438374629 is an equidigital number, since it uses as much as digits as its factorization.

1669438374629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863653446.

The product of its digits is 282175488, while the sum is 68.

The spelling of 1669438374629 in words is "one trillion, six hundred sixty-nine billion, four hundred thirty-eight million, three hundred seventy-four thousand, six hundred twenty-nine".