643515045 has 16 divisors (see below), whose sum is σ = 1074390912. Its totient is φ = 328285760.

The previous prime is 643515007. The next prime is 643515053. The reversal of 643515045 is 540515346.

It is not a de Polignac number, because 643515045 - 2⁷ = 643514917 is a prime.

It is a super-2 number, since 2×643515045² = 828223226282704050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643514997 and 643515015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 932286 + ... + 932975.

It is an arithmetic number, because the mean of its divisors is an integer number (67149432).

Almost surely, 2^643515045 is an apocalyptic number.

It is an amenable number.

643515045 is a deficient number, since it is larger than the sum of its proper divisors (430875867).

643515045 is a wasteful number, since it uses less digits than its factorization.

643515045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865292.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 643515045 is about 25367.5983293650. The cubic root of 643515045 is about 863.3486911927.

It can be divided in two parts, 64351 and 5045, that added together give a palindrome (69396).

The spelling of 643515045 in words is "six hundred forty-three million, five hundred fifteen thousand, forty-five".