1669943385 has 144 divisors (see below), whose sum is σ = 3399684288. Its totient is φ = 785220480.

The previous prime is 1669943377. The next prime is 1669943419. The reversal of 1669943385 is 5833499661.

It is not a de Polignac number, because 1669943385 - 2³ = 1669943377 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5439402 + ... + 5439708.

Almost surely, 2^1669943385 is an apocalyptic number.

1669943385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1669943385 is an abundant number, since it is smaller than the sum of its proper divisors (1729740903).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1669943385 is a wasteful number, since it uses less digits than its factorization.

1669943385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 363 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 1669943385 is about 40864.9407805762. The cubic root of 1669943385 is about 1186.4075886862.

The spelling of 1669943385 in words is "one billion, six hundred sixty-nine million, nine hundred forty-three thousand, three hundred eighty-five".