1669193999 has 4 divisors (see below), whose sum is σ = 1820938920. Its totient is φ = 1517449080.

The previous prime is 1669193989. The next prime is 1669194083. The reversal of 1669193999 is 9993919661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9993919661 = 11 ⋅908538151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669193999 is a prime.

It is a super-2 number, since 2×1669193999² = 5572417212595224002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669193989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75872444 + ... + 75872465.

It is an arithmetic number, because the mean of its divisors is an integer number (455234730).

Almost surely, 2^1669193999 is an apocalyptic number.

1669193999 is a deficient number, since it is larger than the sum of its proper divisors (151744921).

1669193999 is a wasteful number, since it uses less digits than its factorization.

1669193999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151744920.

The product of its digits is 6377292, while the sum is 62.

The square root of 1669193999 is about 40855.7706939913. The cubic root of 1669193999 is about 1186.2300955909.

The spelling of 1669193999 in words is "one billion, six hundred sixty-nine million, one hundred ninety-three thousand, nine hundred ninety-nine".