1669715197 has 4 divisors (see below), whose sum is σ = 1767933756. Its totient is φ = 1571496640.

The previous prime is 1669715189. The next prime is 1669715213. The reversal of 1669715197 is 7915179661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 843670116 + 826045081 = 29046^2 + 28741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669715197 - 2³ = 1669715189 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 (1669715147) 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, 49109254 + ... + 49109287.

It is an arithmetic number, because the mean of its divisors is an integer number (441983439).

Almost surely, 2^1669715197 is an apocalyptic number.

1669715197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1669715197 is a deficient number, since it is larger than the sum of its proper divisors (98218559).

1669715197 is an equidigital number, since it uses as much as digits as its factorization.

1669715197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98218558.

The product of its digits is 714420, while the sum is 52.

The square root of 1669715197 is about 40862.1487075753. The cubic root of 1669715197 is about 1186.3535476712.

The spelling of 1669715197 in words is "one billion, six hundred sixty-nine million, seven hundred fifteen thousand, one hundred ninety-seven".