6453406809 has 20 divisors (see below), whose sum is σ = 9772341876. Its totient is φ = 4243332096.

The previous prime is 6453406759. The next prime is 6453406811. The reversal of 6453406809 is 9086043546.

It can be written as a sum of positive squares in 2 ways, for example, as 3255843600 + 3197563209 = 57060^2 + 56547^2 .

It is not a de Polignac number, because 6453406809 - 2²⁴ = 6436629593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6453406849) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 539784 + ... + 551609.

Almost surely, 2^6453406809 is an apocalyptic number.

It is an amenable number.

6453406809 is a deficient number, since it is larger than the sum of its proper divisors (3318935067).

6453406809 is a wasteful number, since it uses less digits than its factorization.

6453406809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091478 (or 1091469 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6453406809 is about 80333.0990874870. The cubic root of 6453406809 is about 1861.7856602897.

The spelling of 6453406809 in words is "six billion, four hundred fifty-three million, four hundred six thousand, eight hundred nine".