261661466 has 16 divisors (see below), whose sum is σ = 429848640. Its totient is φ = 118471680.

The previous prime is 261661459. The next prime is 261661469. The reversal of 261661466 is 664166162.

261661466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261661469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17486 + ... + 28793.

It is an arithmetic number, because the mean of its divisors is an integer number (26865540).

Almost surely, 2^261661466 is an apocalyptic number.

261661466 is a deficient number, since it is larger than the sum of its proper divisors (168187174).

261661466 is a wasteful number, since it uses less digits than its factorization.

261661466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46549.

The product of its digits is 62208, while the sum is 38.

The square root of 261661466 is about 16175.9533258476. The cubic root of 261661466 is about 639.6070716363.

The spelling of 261661466 in words is "two hundred sixty-one million, six hundred sixty-one thousand, four hundred sixty-six".