261535055 has 32 divisors (see below), whose sum is σ = 344342016. Its totient is φ = 189886464.

The previous prime is 261535049. The next prime is 261535067. The reversal of 261535055 is 550535162.

It is not a de Polignac number, because 261535055 - 2⁴ = 261535039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430562 + ... + 431168.

It is an arithmetic number, because the mean of its divisors is an integer number (10760688).

Almost surely, 2^261535055 is an apocalyptic number.

261535055 is a deficient number, since it is larger than the sum of its proper divisors (82806961).

261535055 is a wasteful number, since it uses less digits than its factorization.

261535055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 261535055 is about 16172.0454797778. The cubic root of 261535055 is about 639.5040550750.

The spelling of 261535055 in words is "two hundred sixty-one million, five hundred thirty-five thousand, fifty-five".