261648558 has 24 divisors (see below), whose sum is σ = 567262800. Its totient is φ = 87161184.

The previous prime is 261648557. The next prime is 261648559. The reversal of 261648558 is 855846162.

It is an interprime number because it is at equal distance from previous prime (261648557) and next prime (261648559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261648557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33138 + ... + 40266.

It is an arithmetic number, because the mean of its divisors is an integer number (23635950).

Almost surely, 2^261648558 is an apocalyptic number.

261648558 is an abundant number, since it is smaller than the sum of its proper divisors (305614242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261648558 is a wasteful number, since it uses less digits than its factorization.

261648558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9176 (or 9173 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 261648558 is about 16175.5543336233. The cubic root of 261648558 is about 639.5965539956.

The spelling of 261648558 in words is "two hundred sixty-one million, six hundred forty-eight thousand, five hundred fifty-eight".