261280313632 has 48 divisors (see below), whose sum is σ = 554323505400. Its totient is φ = 120512765952.

The previous prime is 261280313611. The next prime is 261280313633. The reversal of 261280313632 is 236313082162.

It can be written as a sum of positive squares in 4 ways, for example, as 165450443536 + 95829870096 = 406756^2 + 309564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261280313591 and 261280313600.

It is not an unprimeable number, because it can be changed into a prime (261280313633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441648 + ... + 847120.

Almost surely, 2^261280313632 is an apocalyptic number.

It is an amenable number.

261280313632 is an abundant number, since it is smaller than the sum of its proper divisors (293043191768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261280313632 is a wasteful number, since it uses less digits than its factorization.

261280313632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407045 (or 407037 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 261280313632 its reverse (236313082162), we get a palindrome (497593395794).

The spelling of 261280313632 in words is "two hundred sixty-one billion, two hundred eighty million, three hundred thirteen thousand, six hundred thirty-two".