261464666 has 16 divisors (see below), whose sum is σ = 407116800. Its totient is φ = 125850480.

The previous prime is 261464663. The next prime is 261464669. The reversal of 261464666 is 666464162.

It is an interprime number because it is at equal distance from previous prime (261464663) and next prime (261464669).

It is not an unprimeable number, because it can be changed into a prime (261464663) 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, 17066 + ... + 28533.

It is an arithmetic number, because the mean of its divisors is an integer number (25444800).

Almost surely, 2^261464666 is an apocalyptic number.

261464666 is a deficient number, since it is larger than the sum of its proper divisors (145652134).

261464666 is a wasteful number, since it uses less digits than its factorization.

261464666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45709.

The product of its digits is 248832, while the sum is 41.

The square root of 261464666 is about 16169.8690780105. The cubic root of 261464666 is about 639.4466783308.

The spelling of 261464666 in words is "two hundred sixty-one million, four hundred sixty-four thousand, six hundred sixty-six".