261352556 has 24 divisors (see below), whose sum is σ = 466821600. Its totient is φ = 127999872.

The previous prime is 261352499. The next prime is 261352589. The reversal of 261352556 is 655253162.

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, 40505 + ... + 46511.

It is an arithmetic number, because the mean of its divisors is an integer number (19450900).

Almost surely, 2^261352556 is an apocalyptic number.

It is an amenable number.

261352556 is a deficient number, since it is larger than the sum of its proper divisors (205469044).

261352556 is a wasteful number, since it uses less digits than its factorization.

261352556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233 (or 6231 counting only the distinct ones).

The product of its digits is 54000, while the sum is 35.

The square root of 261352556 is about 16166.4020734361. The cubic root of 261352556 is about 639.3552719510.

The spelling of 261352556 in words is "two hundred sixty-one million, three hundred fifty-two thousand, five hundred fifty-six".