261335011535 has 12 divisors (see below), whose sum is σ = 339580879992. Its totient is φ = 192985854048.

The previous prime is 261335011523. The next prime is 261335011543. The reversal of 261335011535 is 535110533162.

It is not a de Polignac number, because 261335011535 - 2⁸ = 261335011279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261335011495 and 261335011504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154635257 + ... + 154636946.

It is an arithmetic number, because the mean of its divisors is an integer number (28298406666).

Almost surely, 2^261335011535 is an apocalyptic number.

261335011535 is a deficient number, since it is larger than the sum of its proper divisors (78245868457).

261335011535 is a wasteful number, since it uses less digits than its factorization.

261335011535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309272234 (or 309272221 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 35.

Adding to 261335011535 its reverse (535110533162), we get a palindrome (796445544697).

The spelling of 261335011535 in words is "two hundred sixty-one billion, three hundred thirty-five million, eleven thousand, five hundred thirty-five".