261695577 has 32 divisors (see below), whose sum is σ = 418682880. Its totient is φ = 143277120.

The previous prime is 261695557. The next prime is 261695611. The reversal of 261695577 is 775596162.

261695577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261695577 - 2¹⁴ = 261679193 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (261695527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13674 + ... + 26652.

It is an arithmetic number, because the mean of its divisors is an integer number (13083840).

Almost surely, 2^261695577 is an apocalyptic number.

It is an amenable number.

261695577 is a deficient number, since it is larger than the sum of its proper divisors (156987303).

261695577 is a wasteful number, since it uses less digits than its factorization.

261695577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13053.

The product of its digits is 793800, while the sum is 48.

The square root of 261695577 is about 16177.0076652019. The cubic root of 261695577 is about 639.6348641490.

The spelling of 261695577 in words is "two hundred sixty-one million, six hundred ninety-five thousand, five hundred seventy-seven".