261025055 has 8 divisors (see below), whose sum is σ = 331655472. Its totient is φ = 196536448.

The previous prime is 261025049. The next prime is 261025057. The reversal of 261025055 is 550520162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261025055 - 2¹² = 261020959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261025057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1535357 + ... + 1535526.

It is an arithmetic number, because the mean of its divisors is an integer number (41456934).

Almost surely, 2^261025055 is an apocalyptic number.

261025055 is a deficient number, since it is larger than the sum of its proper divisors (70630417).

261025055 is a wasteful number, since it uses less digits than its factorization.

261025055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070905.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 261025055 is about 16156.2698355778. The cubic root of 261025055 is about 639.0881015343.

The spelling of 261025055 in words is "two hundred sixty-one million, twenty-five thousand, fifty-five".