261244404603 has 80 divisors (see below), whose sum is σ = 482088656896. Its totient is φ = 137289712320.

The previous prime is 261244404587. The next prime is 261244404643. The reversal of 261244404603 is 306404442162.

261244404603 is a `hidden beast` number, since 2 + 6 + 1 + 2 + 4 + 4 + 40 + 4 + 603 = 666.

It is not a de Polignac number, because 261244404603 - 2⁴ = 261244404587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261244404643) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1932150 + ... + 2062932.

Almost surely, 2^261244404603 is an apocalyptic number.

261244404603 is a deficient number, since it is larger than the sum of its proper divisors (220844252293).

261244404603 is a wasteful number, since it uses less digits than its factorization.

261244404603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131086 (or 131077 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 261244404603 its reverse (306404442162), we get a palindrome (567648846765).

The spelling of 261244404603 in words is "two hundred sixty-one billion, two hundred forty-four million, four hundred four thousand, six hundred three".