6440442277 has 4 divisors (see below), whose sum is σ = 6443268076. Its totient is φ = 6437616480.

The previous prime is 6440442251. The next prime is 6440442311. The reversal of 6440442277 is 7722440446.

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 5107389156 + 1333053121 = 71466^2 + 36511^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440442277 - 2¹¹ = 6440440229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440442077) 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, 1409478 + ... + 1414039.

It is an arithmetic number, because the mean of its divisors is an integer number (1610817019).

Almost surely, 2^6440442277 is an apocalyptic number.

It is an amenable number.

6440442277 is a deficient number, since it is larger than the sum of its proper divisors (2825799).

6440442277 is a wasteful number, since it uses less digits than its factorization.

6440442277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825798.

The product of its (nonzero) digits is 301056, while the sum is 40.

The square root of 6440442277 is about 80252.3661769546. The cubic root of 6440442277 is about 1860.5380835208.

The spelling of 6440442277 in words is "six billion, four hundred forty million, four hundred forty-two thousand, two hundred seventy-seven".