1669643252 has 24 divisors (see below), whose sum is σ = 2974864200. Its totient is φ = 819818496.

The previous prime is 1669643203. The next prime is 1669643257. The reversal of 1669643252 is 2523469661.

It can be written as a sum of positive squares in 4 ways, for example, as 318051556 + 1351591696 = 17834^2 + 36764^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669643257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32324 + ... + 66212.

It is an arithmetic number, because the mean of its divisors is an integer number (123952675).

Almost surely, 2^1669643252 is an apocalyptic number.

It is an amenable number.

1669643252 is a deficient number, since it is larger than the sum of its proper divisors (1305220948).

1669643252 is a wasteful number, since it uses less digits than its factorization.

1669643252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34115 (or 34113 counting only the distinct ones).

The product of its digits is 466560, while the sum is 44.

The square root of 1669643252 is about 40861.2683601476. The cubic root of 1669643252 is about 1186.3365081521.

The spelling of 1669643252 in words is "one billion, six hundred sixty-nine million, six hundred forty-three thousand, two hundred fifty-two".