6441905687 has 6 divisors (see below), whose sum is σ = 7493645448. Its totient is φ = 5521633404.

The previous prime is 6441905669. The next prime is 6441905719. The reversal of 6441905687 is 7865091446.

It is not a de Polignac number, because 6441905687 - 2⁶ = 6441905623 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 (6441905627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65733683 + ... + 65733780.

It is an arithmetic number, because the mean of its divisors is an integer number (1248940908).

Almost surely, 2^6441905687 is an apocalyptic number.

6441905687 is a deficient number, since it is larger than the sum of its proper divisors (1051739761).

6441905687 is a wasteful number, since it uses less digits than its factorization.

6441905687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131467477 (or 131467470 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 6441905687 is about 80261.4832095695. The cubic root of 6441905687 is about 1860.6789912268.

The spelling of 6441905687 in words is "six billion, four hundred forty-one million, nine hundred five thousand, six hundred eighty-seven".