6541989961 has 8 divisors (see below), whose sum is σ = 7061572224. Its totient is φ = 6024743760.

The previous prime is 6541989941. The next prime is 6541989967. The reversal of 6541989961 is 1699891456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6541989961 - 2²⁷ = 6407772233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6541989896 and 6541989905.

It is not an unprimeable number, because it can be changed into a prime (6541989967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578191 + ... + 589396.

It is an arithmetic number, because the mean of its divisors is an integer number (882696528).

Almost surely, 2^6541989961 is an apocalyptic number.

It is an amenable number.

6541989961 is a deficient number, since it is larger than the sum of its proper divisors (519582263).

6541989961 is a wasteful number, since it uses less digits than its factorization.

6541989961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168031.

The product of its digits is 4199040, while the sum is 58.

The square root of 6541989961 is about 80882.5689564816. The cubic root of 6541989961 is about 1870.2656224243.

The spelling of 6541989961 in words is "six billion, five hundred forty-one million, nine hundred eighty-nine thousand, nine hundred sixty-one".