261488329361 has 16 divisors (see below), whose sum is σ = 316641735936. Its totient is φ = 210802646016.

The previous prime is 261488329343. The next prime is 261488329363. The reversal of 261488329361 is 163923884162.

261488329361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261488329361 - 2²² = 261484135057 is a prime.

It is a super-2 number, since 2×261488329361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261488329363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 587096 + ... + 931481.

It is an arithmetic number, because the mean of its divisors is an integer number (19790108496).

Almost surely, 2^261488329361 is an apocalyptic number.

It is an amenable number.

261488329361 is a deficient number, since it is larger than the sum of its proper divisors (55153406575).

261488329361 is a wasteful number, since it uses less digits than its factorization.

261488329361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520048.

The product of its digits is 2985984, while the sum is 53.

The spelling of 261488329361 in words is "two hundred sixty-one billion, four hundred eighty-eight million, three hundred twenty-nine thousand, three hundred sixty-one".