6561116156 has 24 divisors (see below), whose sum is σ = 13133030400. Its totient is φ = 2809593072.

The previous prime is 6561116123. The next prime is 6561116197. The reversal of 6561116156 is 6516111656.

It is a super-3 number, since 3×6561116156³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61556 + ... + 130043.

It is an arithmetic number, because the mean of its divisors is an integer number (547209600).

Almost surely, 2^6561116156 is an apocalyptic number.

It is an amenable number.

6561116156 is an abundant number, since it is smaller than the sum of its proper divisors (6571914244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561116156 is a wasteful number, since it uses less digits than its factorization.

6561116156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192833 (or 192831 counting only the distinct ones).

The product of its digits is 32400, while the sum is 38.

The square root of 6561116156 is about 81000.7170091722. The cubic root of 6561116156 is about 1872.0864884280.

The spelling of 6561116156 in words is "six billion, five hundred sixty-one million, one hundred sixteen thousand, one hundred fifty-six".