6541116399 has 6 divisors (see below), whose sum is σ = 9448279256. Its totient is φ = 4360744260.

The previous prime is 6541116397. The next prime is 6541116433. The reversal of 6541116399 is 9936111456.

6541116399 is a `hidden beast` number, since 6 + 5 + 4 + 1 + 1 + 1 + 639 + 9 = 666.

It is not a de Polignac number, because 6541116399 - 2¹ = 6541116397 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 (6541116391) 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, 363395347 + ... + 363395364.

Almost surely, 2^6541116399 is an apocalyptic number.

6541116399 is a deficient number, since it is larger than the sum of its proper divisors (2907162857).

6541116399 is a wasteful number, since it uses less digits than its factorization.

6541116399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726790717 (or 726790714 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 6541116399 is about 80877.1685891637. The cubic root of 6541116399 is about 1870.1823722352.

It can be divided in two parts, 65411 and 16399, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 6541116399 in words is "six billion, five hundred forty-one million, one hundred sixteen thousand, three hundred ninety-nine".