261543736115206 has 8 divisors (see below), whose sum is σ = 405843728454720. Its totient is φ = 126262493296968.

The previous prime is 261543736115197. The next prime is 261543736115209. The reversal of 261543736115206 is 602511637345162.

261543736115206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×261543736115206² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261543736115209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2254687380246 + ... + 2254687380361.

It is an arithmetic number, because the mean of its divisors is an integer number (50730466056840).

Almost surely, 2^{261543736115206} is an apocalyptic number.

261543736115206 is a deficient number, since it is larger than the sum of its proper divisors (144299992339514).

261543736115206 is a wasteful number, since it uses less digits than its factorization.

261543736115206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509374760638.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 261543736115206 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred thirty-six million, one hundred fifteen thousand, two hundred six".