1669243497 has 4 divisors (see below), whose sum is σ = 2225658000. Its totient is φ = 1112828996.

The previous prime is 1669243421. The next prime is 1669243501. The reversal of 1669243497 is 7943429661.

It is a happy number.

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 1669243497 - 2¹⁴ = 1669227113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1669243417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278207247 + ... + 278207252.

It is an arithmetic number, because the mean of its divisors is an integer number (556414500).

Almost surely, 2^1669243497 is an apocalyptic number.

It is an amenable number.

1669243497 is a deficient number, since it is larger than the sum of its proper divisors (556414503).

1669243497 is an equidigital number, since it uses as much as digits as its factorization.

1669243497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556414502.

The product of its digits is 1959552, while the sum is 51.

The square root of 1669243497 is about 40856.3764546001. The cubic root of 1669243497 is about 1186.2418208980.

The spelling of 1669243497 in words is "one billion, six hundred sixty-nine million, two hundred forty-three thousand, four hundred ninety-seven".