1669612817 has 4 divisors (see below), whose sum is σ = 1681624560. Its totient is φ = 1657601076.

The previous prime is 1669612807. The next prime is 1669612829. The reversal of 1669612817 is 7182169661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1669612817 - 2⁴ = 1669612801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669612807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6005663 + ... + 6005940.

It is an arithmetic number, because the mean of its divisors is an integer number (420406140).

Almost surely, 2^1669612817 is an apocalyptic number.

It is an amenable number.

1669612817 is a deficient number, since it is larger than the sum of its proper divisors (12011743).

1669612817 is a wasteful number, since it uses less digits than its factorization.

1669612817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011742.

The product of its digits is 217728, while the sum is 47.

The square root of 1669612817 is about 40860.8959397613. The cubic root of 1669612817 is about 1186.3292997517.

The spelling of 1669612817 in words is "one billion, six hundred sixty-nine million, six hundred twelve thousand, eight hundred seventeen".