261271852720607 has 8 divisors (see below), whose sum is σ = 264580371440640. Its totient is φ = 257963366002680.

The previous prime is 261271852720451. The next prime is 261271852720631. The reversal of 261271852720607 is 706027258172162.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261271852720607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261271852720687) 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, 8649278 + ... + 24440820.

It is an arithmetic number, because the mean of its divisors is an integer number (33072546430080).

Almost surely, 2^{261271852720607} is an apocalyptic number.

261271852720607 is a deficient number, since it is larger than the sum of its proper divisors (3308518720033).

261271852720607 is a wasteful number, since it uses less digits than its factorization.

261271852720607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001053.

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 261271852720607 in words is "two hundred sixty-one trillion, two hundred seventy-one billion, eight hundred fifty-two million, seven hundred twenty thousand, six hundred seven".