6561202149 has 8 divisors (see below), whose sum is σ = 9720299520. Its totient is φ = 4374134748.

The previous prime is 6561202129. The next prime is 6561202163. The reversal of 6561202149 is 9412021656.

6561202149 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6561202149 - 2⁵ = 6561202117 is a prime.

It is a super-3 number, since 3×6561202149³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561202129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121503717 + ... + 121503770.

It is an arithmetic number, because the mean of its divisors is an integer number (1215037440).

Almost surely, 2^6561202149 is an apocalyptic number.

It is an amenable number.

6561202149 is a deficient number, since it is larger than the sum of its proper divisors (3159097371).

6561202149 is a wasteful number, since it uses less digits than its factorization.

6561202149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243007496 (or 243007490 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 6561202149 is about 81001.2478237218. The cubic root of 6561202149 is about 1872.0946672006.

The spelling of 6561202149 in words is "six billion, five hundred sixty-one million, two hundred two thousand, one hundred forty-nine".