261044165 has 8 divisors (see below), whose sum is σ = 314565120. Its totient is φ = 207960592.

The previous prime is 261044159. The next prime is 261044207. The reversal of 261044165 is 561440162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261044165 - 2¹⁶ = 260978629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108029 + ... + 110418.

It is an arithmetic number, because the mean of its divisors is an integer number (39320640).

Almost surely, 2^261044165 is an apocalyptic number.

It is an amenable number.

261044165 is a deficient number, since it is larger than the sum of its proper divisors (53520955).

261044165 is a wasteful number, since it uses less digits than its factorization.

261044165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218691.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 261044165 is about 16156.8612360198. The cubic root of 261044165 is about 639.1036973240.

The spelling of 261044165 in words is "two hundred sixty-one million, forty-four thousand, one hundred sixty-five".