261948655 has 8 divisors (see below), whose sum is σ = 314443584. Its totient is φ = 209488800.

The previous prime is 261948629. The next prime is 261948683. The reversal of 261948655 is 556849162.

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

It is not a de Polignac number, because 261948655 - 2¹³ = 261940463 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12250 + ... + 25960.

It is an arithmetic number, because the mean of its divisors is an integer number (39305448).

Almost surely, 2^261948655 is an apocalyptic number.

261948655 is a deficient number, since it is larger than the sum of its proper divisors (52494929).

261948655 is a wasteful number, since it uses less digits than its factorization.

261948655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17537.

The product of its digits is 518400, while the sum is 46.

The square root of 261948655 is about 16184.8279261783. The cubic root of 261948655 is about 639.8409883279.

The spelling of 261948655 in words is "two hundred sixty-one million, nine hundred forty-eight thousand, six hundred fifty-five".