261217921459 has 16 divisors (see below), whose sum is σ = 300937400064. Its totient is φ = 224409301600.

The previous prime is 261217921417. The next prime is 261217921477. The reversal of 261217921459 is 954129712162.

It is not a de Polignac number, because 261217921459 - 2⁹ = 261217920947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261217921409) 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, 6198772 + ... + 6240769.

It is an arithmetic number, because the mean of its divisors is an integer number (18808587504).

Almost surely, 2^261217921459 is an apocalyptic number.

261217921459 is a deficient number, since it is larger than the sum of its proper divisors (39719478605).

261217921459 is a wasteful number, since it uses less digits than its factorization.

261217921459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12439658.

The product of its digits is 544320, while the sum is 49.

The spelling of 261217921459 in words is "two hundred sixty-one billion, two hundred seventeen million, nine hundred twenty-one thousand, four hundred fifty-nine".