1645210465 has 8 divisors (see below), whose sum is σ = 1974478248. Its totient is φ = 1316017920.

The previous prime is 1645210459. The next prime is 1645210507. The reversal of 1645210465 is 5640125461.

It can be written as a sum of positive squares in 4 ways, for example, as 13373649 + 1631836816 = 3657^2 + 40396^2 .

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

It is not a de Polignac number, because 1645210465 - 2⁵ = 1645210433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645210465.

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, 57319 + ... + 81091.

It is an arithmetic number, because the mean of its divisors is an integer number (246809781).

Almost surely, 2^1645210465 is an apocalyptic number.

It is an amenable number.

1645210465 is a deficient number, since it is larger than the sum of its proper divisors (329267783).

1645210465 is a wasteful number, since it uses less digits than its factorization.

1645210465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37619.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1645210465 is about 40561.1940775910. The cubic root of 1645210465 is about 1180.5212828961.

The spelling of 1645210465 in words is "one billion, six hundred forty-five million, two hundred ten thousand, four hundred sixty-five".