261421603313 has 8 divisors (see below), whose sum is σ = 282771185088. Its totient is φ = 240249196944.

The previous prime is 261421603291. The next prime is 261421603321. The reversal of 261421603313 is 313306124162.

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

It is a cyclic number.

It is not a de Polignac number, because 261421603313 - 2¹⁶ = 261421537777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261421603313.

It is not an unprimeable number, because it can be changed into a prime (261421603393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44290781 + ... + 44296682.

It is an arithmetic number, because the mean of its divisors is an integer number (35346398136).

Almost surely, 2^261421603313 is an apocalyptic number.

It is an amenable number.

261421603313 is a deficient number, since it is larger than the sum of its proper divisors (21349581775).

261421603313 is a wasteful number, since it uses less digits than its factorization.

261421603313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88587703.

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 261421603313 its reverse (313306124162), we get a palindrome (574727727475).

The spelling of 261421603313 in words is "two hundred sixty-one billion, four hundred twenty-one million, six hundred three thousand, three hundred thirteen".