261610455 has 16 divisors (see below), whose sum is σ = 422894304. Its totient is φ = 138086400.

The previous prime is 261610451. The next prime is 261610471. The reversal of 261610455 is 554016162.

It is not a de Polignac number, because 261610455 - 2² = 261610451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261610451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88446 + ... + 91355.

It is an arithmetic number, because the mean of its divisors is an integer number (26430894).

Almost surely, 2^261610455 is an apocalyptic number.

261610455 is a deficient number, since it is larger than the sum of its proper divisors (161283849).

261610455 is a wasteful number, since it uses less digits than its factorization.

261610455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179906.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 261610455 is about 16174.3764949379. The cubic root of 261610455 is about 639.5655050563.

The spelling of 261610455 in words is "two hundred sixty-one million, six hundred ten thousand, four hundred fifty-five".