261606610 has 16 divisors (see below), whose sum is σ = 475465536. Its totient is φ = 103626288.

The previous prime is 261606599. The next prime is 261606617. The reversal of 261606610 is 16606162.

It is not an unprimeable number, because it can be changed into a prime (261606617) by changing a digit.

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, 125964 + ... + 128023.

It is an arithmetic number, because the mean of its divisors is an integer number (29716596).

Almost surely, 2^261606610 is an apocalyptic number.

261606610 is a deficient number, since it is larger than the sum of its proper divisors (213858926).

261606610 is a wasteful number, since it uses less digits than its factorization.

261606610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254097.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 261606610 is about 16174.2576336597. The cubic root of 261606610 is about 639.5623717190.

The spelling of 261606610 in words is "two hundred sixty-one million, six hundred six thousand, six hundred ten".