261573207026647 has 8 divisors (see below), whose sum is σ = 267665008506896. Its totient is φ = 255481801166592.

The previous prime is 261573207026531. The next prime is 261573207026669. The reversal of 261573207026647 is 746620702375162.

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 261573207026647 - 2¹⁹ = 261573206502359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261573207026591 and 261573207026600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261573207020647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97567098 + ... + 100212199.

It is an arithmetic number, because the mean of its divisors is an integer number (33458126063362).

Almost surely, 2^{261573207026647} is an apocalyptic number.

261573207026647 is a deficient number, since it is larger than the sum of its proper divisors (6091801480249).

261573207026647 is a wasteful number, since it uses less digits than its factorization.

261573207026647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197810097.

The product of its (nonzero) digits is 35562240, while the sum is 58.

The spelling of 261573207026647 in words is "two hundred sixty-one trillion, five hundred seventy-three billion, two hundred seven million, twenty-six thousand, six hundred forty-seven".