6437642409 has 12 divisors (see below), whose sum is σ = 10144163952. Its totient is φ = 3901601400.

The previous prime is 6437642357. The next prime is 6437642411. The reversal of 6437642409 is 9042467346.

It is a happy number.

It is not a de Polignac number, because 6437642409 - 2⁹ = 6437641897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6437642009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32513247 + ... + 32513444.

It is an arithmetic number, because the mean of its divisors is an integer number (845346996).

Almost surely, 2^6437642409 is an apocalyptic number.

It is an amenable number.

6437642409 is a deficient number, since it is larger than the sum of its proper divisors (3706521543).

6437642409 is a wasteful number, since it uses less digits than its factorization.

6437642409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65026708 (or 65026705 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The square root of 6437642409 is about 80234.9201345649. The cubic root of 6437642409 is about 1860.2684324689.

It can be divided in two parts, 6437 and 642409, that added together give a palindrome (648846).

The spelling of 6437642409 in words is "six billion, four hundred thirty-seven million, six hundred forty-two thousand, four hundred nine".