261606330 has 48 divisors (see below), whose sum is σ = 681206760. Its totient is φ = 69656064.

The previous prime is 261606313. The next prime is 261606337. The reversal of 261606330 is 33606162.

261606330 is a `hidden beast` number, since 26 + 1 + 6 + 0 + 633 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 232349049 + 29257281 = 15243^2 + 5409^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261606294 and 261606303.

It is not an unprimeable number, because it can be changed into a prime (261606337) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 71014 + ... + 74606.

Almost surely, 2^261606330 is an apocalyptic number.

261606330 is an abundant number, since it is smaller than the sum of its proper divisors (419600430).

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

261606330 is a wasteful number, since it uses less digits than its factorization.

261606330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 261606330 is about 16174.2489779278. The cubic root of 261606330 is about 639.5621435424.

The spelling of 261606330 in words is "two hundred sixty-one million, six hundred six thousand, three hundred thirty".