1669921874 has 4 divisors (see below), whose sum is σ = 2504882814. Its totient is φ = 834960936.

The previous prime is 1669921873. The next prime is 1669921889. The reversal of 1669921874 is 4781299661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4781299661 = 1747 ⋅2736863.

It can be written as a sum of positive squares in only one way, i.e., 1373221249 + 296700625 = 37057^2 + 17225^2 .

It is not an unprimeable number, because it can be changed into a prime (1669921871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417480467 + ... + 417480470.

Almost surely, 2^1669921874 is an apocalyptic number.

1669921874 is a deficient number, since it is larger than the sum of its proper divisors (834960940).

1669921874 is an equidigital number, since it uses as much as digits as its factorization.

1669921874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834960939.

The product of its digits is 1306368, while the sum is 53.

The square root of 1669921874 is about 40864.6775834583. The cubic root of 1669921874 is about 1186.4024945168.

It can be divided in two parts, 1 and 669921874, that added together give a cube (669921875 = 875³).

The spelling of 1669921874 in words is "one billion, six hundred sixty-nine million, nine hundred twenty-one thousand, eight hundred seventy-four".