1669612813 has 6 divisors (see below), whose sum is σ = 1835194382. Its totient is φ = 1517829720.

The previous prime is 1669612807. The next prime is 1669612829. The reversal of 1669612813 is 3182169661.

It can be written as a sum of positive squares in only one way, i.e., 1134477124 + 535135689 = 33682^2 + 23133^2 .

It is not a de Polignac number, because 1669612813 - 2¹³ = 1669604621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1669612813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669612873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6899106 + ... + 6899347.

Almost surely, 2^1669612813 is an apocalyptic number.

It is an amenable number.

1669612813 is a deficient number, since it is larger than the sum of its proper divisors (165581569).

1669612813 is a wasteful number, since it uses less digits than its factorization.

1669612813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13798475 (or 13798464 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 1669612813 is about 40860.8958908147. The cubic root of 1669612813 is about 1186.3292988043.

The spelling of 1669612813 in words is "one billion, six hundred sixty-nine million, six hundred twelve thousand, eight hundred thirteen".