261282336561201 has 8 divisors (see below), whose sum is σ = 349132146035904. Its totient is φ = 173810375730320.

The previous prime is 261282336561199. The next prime is 261282336561229. The reversal of 261282336561201 is 102165633282162.

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 261282336561201 - 2¹ = 261282336561199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261282336561241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94462159341 + ... + 94462162106.

It is an arithmetic number, because the mean of its divisors is an integer number (43641518254488).

Almost surely, 2^{261282336561201} is an apocalyptic number.

It is an amenable number.

261282336561201 is a deficient number, since it is larger than the sum of its proper divisors (87849809474703).

261282336561201 is a wasteful number, since it uses less digits than its factorization.

261282336561201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188924321911.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 261282336561201 in words is "two hundred sixty-one trillion, two hundred eighty-two billion, three hundred thirty-six million, five hundred sixty-one thousand, two hundred one".