1643002465 has 8 divisors (see below), whose sum is σ = 2123264808. Its totient is φ = 1213294080.

The previous prime is 1643002457. The next prime is 1643002483. The reversal of 1643002465 is 5642003461.

It can be written as a sum of positive squares in 4 ways, for example, as 308634624 + 1334367841 = 17568^2 + 36529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1643002465 - 2³ = 1643002457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12638416 + ... + 12638545.

It is an arithmetic number, because the mean of its divisors is an integer number (265408101).

Almost surely, 2^1643002465 is an apocalyptic number.

It is an amenable number.

1643002465 is a deficient number, since it is larger than the sum of its proper divisors (480262343).

1643002465 is a wasteful number, since it uses less digits than its factorization.

1643002465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25276979.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1643002465 is about 40533.9668056311. The cubic root of 1643002465 is about 1179.9929294319.

The spelling of 1643002465 in words is "one billion, six hundred forty-three million, two thousand, four hundred sixty-five".