6440725219 has 4 divisors (see below), whose sum is σ = 6597816120. Its totient is φ = 6283634320.

The previous prime is 6440725183. The next prime is 6440725223. The reversal of 6440725219 is 9125270446.

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

It is a cyclic number.

It is not a de Polignac number, because 6440725219 - 2¹¹ = 6440723171 is a prime.

It is a super-2 number, since 2×6440725219² = 82965882693325195922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440725919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78545389 + ... + 78545470.

It is an arithmetic number, because the mean of its divisors is an integer number (1649454030).

Almost surely, 2^6440725219 is an apocalyptic number.

6440725219 is a deficient number, since it is larger than the sum of its proper divisors (157090901).

6440725219 is a wasteful number, since it uses less digits than its factorization.

6440725219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157090900.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 6440725219 is about 80254.1289841214. The cubic root of 6440725219 is about 1860.5653288886.

The spelling of 6440725219 in words is "six billion, four hundred forty million, seven hundred twenty-five thousand, two hundred nineteen".