1669339661 has 4 divisors (see below), whose sum is σ = 1821097824. Its totient is φ = 1517581500.

The previous prime is 1669339649. The next prime is 1669339699.

It is a happy number.

1669339661 is nontrivially palindromic in base 10.

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 1669339661 - 2¹⁴ = 1669323277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669339961) 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, 75879065 + ... + 75879086.

It is an arithmetic number, because the mean of its divisors is an integer number (455274456).

Almost surely, 2^1669339661 is an apocalyptic number.

1669339661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1669339661 is a deficient number, since it is larger than the sum of its proper divisors (151758163).

1669339661 is a wasteful number, since it uses less digits than its factorization.

1669339661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151758162.

The product of its digits is 944784, while the sum is 50.

The square root of 1669339661 is about 40857.5532918945. The cubic root of 1669339661 is about 1186.2645999929.

The spelling of 1669339661 in words is "one billion, six hundred sixty-nine million, three hundred thirty-nine thousand, six hundred sixty-one".