261155536 has 20 divisors (see below), whose sum is σ = 506332672. Its totient is φ = 130489056.

The previous prime is 261155519. The next prime is 261155549. The reversal of 261155536 is 635551162.

261155536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 23281 + ... + 32623.

Almost surely, 2^261155536 is an apocalyptic number.

It is an amenable number.

261155536 is a deficient number, since it is larger than the sum of its proper divisors (245177136).

261155536 is a wasteful number, since it uses less digits than its factorization.

261155536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11098 (or 11092 counting only the distinct ones).

The product of its digits is 27000, while the sum is 34.

The square root of 261155536 is about 16160.3074228184. The cubic root of 261155536 is about 639.1945727486.

The spelling of 261155536 in words is "two hundred sixty-one million, one hundred fifty-five thousand, five hundred thirty-six".