261502655 has 4 divisors (see below), whose sum is σ = 313803192. Its totient is φ = 209202120.

The previous prime is 261502621. The next prime is 261502667. The reversal of 261502655 is 556205162.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261502655 - 2⁸ = 261502399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26150261 + ... + 26150270.

It is an arithmetic number, because the mean of its divisors is an integer number (78450798).

Almost surely, 2^261502655 is an apocalyptic number.

261502655 is a deficient number, since it is larger than the sum of its proper divisors (52300537).

261502655 is an equidigital number, since it uses as much as digits as its factorization.

261502655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52300536.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 261502655 is about 16171.0437201808. The cubic root of 261502655 is about 639.4776458848.

The spelling of 261502655 in words is "two hundred sixty-one million, five hundred two thousand, six hundred fifty-five".