261169768 has 8 divisors (see below), whose sum is σ = 489693330. Its totient is φ = 130584880.

The previous prime is 261169747. The next prime is 261169829. The reversal of 261169768 is 867961162.

It can be written as a sum of positive squares in only one way, i.e., 261080964 + 88804 = 16158^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16323103 + ... + 16323118.

Almost surely, 2^261169768 is an apocalyptic number.

It is an amenable number.

261169768 is a deficient number, since it is larger than the sum of its proper divisors (228523562).

261169768 is a wasteful number, since it uses less digits than its factorization.

261169768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32646227 (or 32646223 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 261169768 is about 16160.7477549772. The cubic root of 261169768 is about 639.2061837755.

The spelling of 261169768 in words is "two hundred sixty-one million, one hundred sixty-nine thousand, seven hundred sixty-eight".