6400450109 has 4 divisors (see below), whose sum is σ = 6443406300. Its totient is φ = 6357493920.

The previous prime is 6400450103. The next prime is 6400450141. The reversal of 6400450109 is 9010540046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 574944484 + 5825505625 = 23978^2 + 76325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6400450109 is a prime.

It is a super-2 number, since 2×6400450109² = 81931523195596223762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400450103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21477872 + ... + 21478169.

It is an arithmetic number, because the mean of its divisors is an integer number (1610851575).

Almost surely, 2^6400450109 is an apocalyptic number.

It is an amenable number.

6400450109 is a deficient number, since it is larger than the sum of its proper divisors (42956191).

6400450109 is a wasteful number, since it uses less digits than its factorization.

6400450109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42956190.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 6400450109 is about 80002.8131317893. The cubic root of 6400450109 is about 1856.6790578604.

The spelling of 6400450109 in words is "six billion, four hundred million, four hundred fifty thousand, one hundred nine".