261450556 has 6 divisors (see below), whose sum is σ = 457538480. Its totient is φ = 130725276.

The previous prime is 261450529. The next prime is 261450569. The reversal of 261450556 is 655054162.

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 as a sum of consecutive naturals, namely, 32681316 + ... + 32681323.

Almost surely, 2^261450556 is an apocalyptic number.

It is an amenable number.

261450556 is a deficient number, since it is larger than the sum of its proper divisors (196087924).

261450556 is a wasteful number, since it uses less digits than its factorization.

261450556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65362643 (or 65362641 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 261450556 is about 16169.4327667980. The cubic root of 261450556 is about 639.4351754955.

The spelling of 261450556 in words is "two hundred sixty-one million, four hundred fifty thousand, five hundred fifty-six".