261655365 has 16 divisors (see below), whose sum is σ = 440683200. Its totient is φ = 132204672.

The previous prime is 261655321. The next prime is 261655369. The reversal of 261655365 is 563556162.

261655365 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 261655365 - 2⁷ = 261655237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261655369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458760 + ... + 459329.

It is an arithmetic number, because the mean of its divisors is an integer number (27542700).

Almost surely, 2^261655365 is an apocalyptic number.

It is an amenable number.

261655365 is a deficient number, since it is larger than the sum of its proper divisors (179027835).

261655365 is a wasteful number, since it uses less digits than its factorization.

261655365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918116.

The product of its digits is 162000, while the sum is 39.

The square root of 261655365 is about 16175.7647423545. The cubic root of 261655365 is about 639.6021004890.

The spelling of 261655365 in words is "two hundred sixty-one million, six hundred fifty-five thousand, three hundred sixty-five".