261101968 has 20 divisors (see below), whose sum is σ = 510896988. Its totient is φ = 129257600.

The previous prime is 261101941. The next prime is 261101989. The reversal of 261101968 is 869101162.

It can be written as a sum of positive squares in 2 ways, for example, as 219988224 + 41113744 = 14832^2 + 6412^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79171 + ... + 82402.

Almost surely, 2^261101968 is an apocalyptic number.

It is an amenable number.

261101968 is a deficient number, since it is larger than the sum of its proper divisors (249795020).

261101968 is a wasteful number, since it uses less digits than its factorization.

261101968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161682 (or 161676 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 261101968 is about 16158.6499436061. The cubic root of 261101968 is about 639.1508660788.

The spelling of 261101968 in words is "two hundred sixty-one million, one hundred one thousand, nine hundred sixty-eight".