6541720005 has 16 divisors (see below), whose sum is σ = 10570385664. Its totient is φ = 3454372800.

The previous prime is 6541720001. The next prime is 6541720033. The reversal of 6541720005 is 5000271456.

It is not a de Polignac number, because 6541720005 - 2² = 6541720001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541720001) 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, 2157469 + ... + 2160498.

It is an arithmetic number, because the mean of its divisors is an integer number (660649104).

Almost surely, 2^6541720005 is an apocalyptic number.

It is an amenable number.

6541720005 is a deficient number, since it is larger than the sum of its proper divisors (4028665659).

6541720005 is a wasteful number, since it uses less digits than its factorization.

6541720005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318076.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 6541720005 is about 80880.9001248132. The cubic root of 6541720005 is about 1870.2398964920.

The spelling of 6541720005 in words is "six billion, five hundred forty-one million, seven hundred twenty thousand, five".