261333575286321 has 32 divisors (see below), whose sum is σ = 359937120699648. Its totient is φ = 168530844706560.

The previous prime is 261333575286319. The next prime is 261333575286331. The reversal of 261333575286321 is 123682575333162.

It is not a de Polignac number, because 261333575286321 - 2¹ = 261333575286319 is a prime.

It is a super-2 number, since 2×261333575286321² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261333575286331) 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 31 ways as a sum of consecutive naturals, for example, 1749837111 + ... + 1749986451.

It is an arithmetic number, because the mean of its divisors is an integer number (11248035021864).

Almost surely, 2^{261333575286321} is an apocalyptic number.

It is an amenable number.

261333575286321 is a deficient number, since it is larger than the sum of its proper divisors (98603545413327).

261333575286321 is a wasteful number, since it uses less digits than its factorization.

261333575286321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240681.

The product of its digits is 32659200, while the sum is 57.

The spelling of 261333575286321 in words is "two hundred sixty-one trillion, three hundred thirty-three billion, five hundred seventy-five million, two hundred eighty-six thousand, three hundred twenty-one".