1645365199 has 6 divisors (see below), whose sum is σ = 1704059240. Its totient is φ = 1588627656.

The previous prime is 1645365193. The next prime is 1645365203. The reversal of 1645365199 is 9915635461.

It is not a de Polignac number, because 1645365199 - 2⁵ = 1645365167 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 (1645365193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 977379 + ... + 979060.

Almost surely, 2^1645365199 is an apocalyptic number.

1645365199 is a deficient number, since it is larger than the sum of its proper divisors (58694041).

1645365199 is an equidigital number, since it uses as much as digits as its factorization.

1645365199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956497 (or 1956468 counting only the distinct ones).

The product of its digits is 874800, while the sum is 49.

The square root of 1645365199 is about 40563.1014470048. The cubic root of 1645365199 is about 1180.5582915459.

The spelling of 1645365199 in words is "one billion, six hundred forty-five million, three hundred sixty-five thousand, one hundred ninety-nine".