6401665005 has 16 divisors (see below), whose sum is σ = 10262799360. Its totient is φ = 3407509568.

The previous prime is 6401664979. The next prime is 6401665009. The reversal of 6401665005 is 5005661046.

It is a cyclic number.

It is not a de Polignac number, because 6401665005 - 2¹³ = 6401656813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401665009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411597 + ... + 426866.

It is an arithmetic number, because the mean of its divisors is an integer number (641424960).

Almost surely, 2^6401665005 is an apocalyptic number.

It is an amenable number.

6401665005 is a deficient number, since it is larger than the sum of its proper divisors (3861134355).

6401665005 is a wasteful number, since it uses less digits than its factorization.

6401665005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838980.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 6401665005 is about 80010.4056045212. The cubic root of 6401665005 is about 1856.7965250810.

The spelling of 6401665005 in words is "six billion, four hundred one million, six hundred sixty-five thousand, five".