1669500889 has 4 divisors (see below), whose sum is σ = 1908001024. Its totient is φ = 1431000756.

The previous prime is 1669500881. The next prime is 1669500907. The reversal of 1669500889 is 9880059661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9880059661 = 379 ⋅26068759.

It is a cyclic number.

It is not a de Polignac number, because 1669500889 - 2³ = 1669500881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669500881) 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, 119250057 + ... + 119250070.

It is an arithmetic number, because the mean of its divisors is an integer number (477000256).

Almost surely, 2^1669500889 is an apocalyptic number.

It is an amenable number.

1669500889 is a deficient number, since it is larger than the sum of its proper divisors (238500135).

1669500889 is an equidigital number, since it uses as much as digits as its factorization.

1669500889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238500134.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 1669500889 is about 40859.5262943662. The cubic root of 1669500889 is about 1186.3027893273.

The spelling of 1669500889 in words is "one billion, six hundred sixty-nine million, five hundred thousand, eight hundred eighty-nine".