6444661607 has 4 divisors (see below), whose sum is σ = 6444980640. Its totient is φ = 6444342576.

The previous prime is 6444661577. The next prime is 6444661697. The reversal of 6444661607 is 7061664446.

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 6444661607 - 2⁶ = 6444661543 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 (6444661697) 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, 127007 + ... + 170352.

It is an arithmetic number, because the mean of its divisors is an integer number (1611245160).

Almost surely, 2^6444661607 is an apocalyptic number.

6444661607 is a deficient number, since it is larger than the sum of its proper divisors (319033).

6444661607 is a wasteful number, since it uses less digits than its factorization.

6444661607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319032.

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 6444661607 is about 80278.6497582016. The cubic root of 6444661607 is about 1860.9442932256.

The spelling of 6444661607 in words is "six billion, four hundred forty-four million, six hundred sixty-one thousand, six hundred seven".