261244404604 has 12 divisors (see below), whose sum is σ = 457184524104. Its totient is φ = 130620254864.

The previous prime is 261244404587. The next prime is 261244404643. The reversal of 261244404604 is 406404442162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160759 + ... + 740494.

It is an arithmetic number, because the mean of its divisors is an integer number (38098710342).

Almost surely, 2^261244404604 is an apocalyptic number.

It is an amenable number.

261244404604 is a deficient number, since it is larger than the sum of its proper divisors (195940119500).

261244404604 is a wasteful number, since it uses less digits than its factorization.

261244404604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973724 (or 973722 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 37.

Adding to 261244404604 its reverse (406404442162), we get a palindrome (667648846766).

The spelling of 261244404604 in words is "two hundred sixty-one billion, two hundred forty-four million, four hundred four thousand, six hundred four".