261543674103251 has 8 divisors (see below), whose sum is σ = 269330709881904. Its totient is φ = 253834121268000.

The previous prime is 261543674103203. The next prime is 261543674103253. The reversal of 261543674103251 is 152301476345162.

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 261543674103251 - 2³⁴ = 261526494234067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261543674103251.

It is not an unprimeable number, because it can be changed into a prime (261543674103253) by changing a digit.

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, 19370729000 + ... + 19370742501.

It is an arithmetic number, because the mean of its divisors is an integer number (33666338735238).

Almost surely, 2^{261543674103251} is an apocalyptic number.

261543674103251 is a deficient number, since it is larger than the sum of its proper divisors (7787035778653).

261543674103251 is a wasteful number, since it uses less digits than its factorization.

261543674103251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38741471701.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 261543674103251 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred seventy-four million, one hundred three thousand, two hundred fifty-one".