261019168 has 12 divisors (see below), whose sum is σ = 513881550. Its totient is φ = 130509568.

The previous prime is 261019133. The next prime is 261019189. The reversal of 261019168 is 861910162.

261019168 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 236298384 + 24720784 = 15372^2 + 4972^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4078393 + ... + 4078456.

Almost surely, 2^261019168 is an apocalyptic number.

It is an amenable number.

261019168 is a deficient number, since it is larger than the sum of its proper divisors (252862382).

261019168 is an equidigital number, since it uses as much as digits as its factorization.

261019168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8156859 (or 8156851 counting only the distinct ones).

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

The square root of 261019168 is about 16156.0876452191. The cubic root of 261019168 is about 639.0832969637.

The spelling of 261019168 in words is "two hundred sixty-one million, nineteen thousand, one hundred sixty-eight".