643054465 has 12 divisors (see below), whose sum is σ = 790039764. Its totient is φ = 502472544.

The previous prime is 643054429. The next prime is 643054469. The reversal of 643054465 is 564450346.

It can be written as a sum of positive squares in 2 ways, for example, as 353101681 + 289952784 = 18791^2 + 17028^2 .

It is not a de Polignac number, because 643054465 - 2¹⁵ = 643021697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643054469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25534 + ... + 44023.

It is an arithmetic number, because the mean of its divisors is an integer number (65836647).

Almost surely, 2^643054465 is an apocalyptic number.

It is an amenable number.

643054465 is a deficient number, since it is larger than the sum of its proper divisors (146985299).

643054465 is an equidigital number, since it uses as much as digits as its factorization.

643054465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69648 (or 69605 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

The square root of 643054465 is about 25358.5185884349. The cubic root of 643054465 is about 863.1426685320.

The spelling of 643054465 in words is "six hundred forty-three million, fifty-four thousand, four hundred sixty-five".