6644042407 has 4 divisors (see below), whose sum is σ = 6932913840. Its totient is φ = 6355170976.

The previous prime is 6644042401. The next prime is 6644042441. The reversal of 6644042407 is 7042404466.

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 6644042407 - 2²³ = 6635653799 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 (6644042401) 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, 144435682 + ... + 144435727.

It is an arithmetic number, because the mean of its divisors is an integer number (1733228460).

Almost surely, 2^6644042407 is an apocalyptic number.

6644042407 is a deficient number, since it is larger than the sum of its proper divisors (288871433).

6644042407 is a wasteful number, since it uses less digits than its factorization.

6644042407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288871432.

The product of its (nonzero) digits is 129024, while the sum is 37.

The square root of 6644042407 is about 81510.9956202229. The cubic root of 6644042407 is about 1879.9406204838.

The spelling of 6644042407 in words is "six billion, six hundred forty-four million, forty-two thousand, four hundred seven".