6447740009 has 4 divisors (see below), whose sum is σ = 6449212800. Its totient is φ = 6446267220.

The previous prime is 6447739999. The next prime is 6447740021. The reversal of 6447740009 is 9000477446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9000477446 = 2 ⋅4500238723.

It is a cyclic number.

It is not a de Polignac number, because 6447740009 - 2¹² = 6447735913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6447740309) 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, 729809 + ... + 738590.

It is an arithmetic number, because the mean of its divisors is an integer number (1612303200).

Almost surely, 2^6447740009 is an apocalyptic number.

It is an amenable number.

6447740009 is a deficient number, since it is larger than the sum of its proper divisors (1472791).

6447740009 is a wasteful number, since it uses less digits than its factorization.

6447740009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472790.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 6447740009 is about 80297.8206989455. The cubic root of 6447740009 is about 1861.2405499355.

The spelling of 6447740009 in words is "six billion, four hundred forty-seven million, seven hundred forty thousand, nine".