261543145162735 has 8 divisors (see below), whose sum is σ = 313851864525696. Its totient is φ = 209234455909920.

The previous prime is 261543145162723. The next prime is 261543145162811. The reversal of 261543145162735 is 537261541345162.

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

It is not a de Polignac number, because 261543145162735 - 2⁵ = 261543145162703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22395970 + ... + 32010400.

It is an arithmetic number, because the mean of its divisors is an integer number (39231483065712).

Almost surely, 2^{261543145162735} is an apocalyptic number.

261543145162735 is a deficient number, since it is larger than the sum of its proper divisors (52308719362961).

261543145162735 is an equidigital number, since it uses as much as digits as its factorization.

261543145162735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15055073.

The product of its digits is 18144000, while the sum is 55.

The spelling of 261543145162735 in words is "two hundred sixty-one trillion, five hundred forty-three billion, one hundred forty-five million, one hundred sixty-two thousand, seven hundred thirty-five".