261323310536 has 16 divisors (see below), whose sum is σ = 489987098700. Its totient is φ = 130660084224.

The previous prime is 261323310533. The next prime is 261323310551. The reversal of 261323310536 is 635013323162.

It can be written as a sum of positive squares in 2 ways, for example, as 228092208100 + 33231102436 = 477590^2 + 182294^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261323310496 and 261323310505.

It is not an unprimeable number, because it can be changed into a prime (261323310533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819956 + ... + 1093148.

Almost surely, 2^261323310536 is an apocalyptic number.

It is an amenable number.

261323310536 is a deficient number, since it is larger than the sum of its proper divisors (228663788164).

261323310536 is a wasteful number, since it uses less digits than its factorization.

261323310536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392768 (or 392764 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 35.

Adding to 261323310536 its reverse (635013323162), we get a palindrome (896336633698).

The spelling of 261323310536 in words is "two hundred sixty-one billion, three hundred twenty-three million, three hundred ten thousand, five hundred thirty-six".