261533571720413 has 16 divisors (see below), whose sum is σ = 263544257867520. Its totient is φ = 259528228454016.

The previous prime is 261533571720397. The next prime is 261533571720541. The reversal of 261533571720413 is 314027175335162.

It is a cyclic number.

It is not a de Polignac number, because 261533571720413 - 2⁴ = 261533571720397 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 (261533571720613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2015312993 + ... + 2015442761.

It is an arithmetic number, because the mean of its divisors is an integer number (16471516116720).

Almost surely, 2^{261533571720413} is an apocalyptic number.

It is an amenable number.

261533571720413 is a deficient number, since it is larger than the sum of its proper divisors (2010686147107).

261533571720413 is a wasteful number, since it uses less digits than its factorization.

261533571720413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150236.

The product of its (nonzero) digits is 3175200, while the sum is 50.

The spelling of 261533571720413 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, five hundred seventy-one million, seven hundred twenty thousand, four hundred thirteen".