1669604193938 has 16 divisors (see below), whose sum is σ = 2572225153560. Its totient is φ = 812198128896.

The previous prime is 1669604193883. The next prime is 1669604193947. The reversal of 1669604193938 is 8393914069661.

It can be written as a sum of positive squares in 4 ways, for example, as 1556114038249 + 113490155689 = 1247443^2 + 336883^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894728 + ... + 2034636.

Almost surely, 2^{1669604193938} is an apocalyptic number.

1669604193938 is a deficient number, since it is larger than the sum of its proper divisors (902620959622).

1669604193938 is a wasteful number, since it uses less digits than its factorization.

1669604193938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159741.

The product of its (nonzero) digits is 45349632, while the sum is 65.

The spelling of 1669604193938 in words is "one trillion, six hundred sixty-nine billion, six hundred four million, one hundred ninety-three thousand, nine hundred thirty-eight".