261335535445 has 16 divisors (see below), whose sum is σ = 319010811840. Its totient is φ = 205524088080.

The previous prime is 261335535437. The next prime is 261335535463. The reversal of 261335535445 is 544535533162.

It is not a de Polignac number, because 261335535445 - 2³ = 261335535437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261335535395 and 261335535404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899650 + ... + 1154140.

It is an arithmetic number, because the mean of its divisors is an integer number (19938175740).

Almost surely, 2^261335535445 is an apocalyptic number.

It is an amenable number.

261335535445 is a deficient number, since it is larger than the sum of its proper divisors (57675276395).

261335535445 is an frugal number, since it uses more digits than its factorization.

261335535445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254673 (or 254555 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 46.

The spelling of 261335535445 in words is "two hundred sixty-one billion, three hundred thirty-five million, five hundred thirty-five thousand, four hundred forty-five".