261552465 has 12 divisors (see below), whose sum is σ = 453357684. Its totient is φ = 139494624.

The previous prime is 261552457. The next prime is 261552469. The reversal of 261552465 is 564255162.

261552465 is a `hidden beast` number, since 2 + 61 + 552 + 46 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 84768849 + 176783616 = 9207^2 + 13296^2 .

It is not a de Polignac number, because 261552465 - 2³ = 261552457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261552469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2906094 + ... + 2906183.

It is an arithmetic number, because the mean of its divisors is an integer number (37779807).

Almost surely, 2^261552465 is an apocalyptic number.

It is an amenable number.

261552465 is a deficient number, since it is larger than the sum of its proper divisors (191805219).

261552465 is a wasteful number, since it uses less digits than its factorization.

261552465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812288 (or 5812285 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 261552465 is about 16172.5837453389. The cubic root of 261552465 is about 639.5182450384.

The spelling of 261552465 in words is "two hundred sixty-one million, five hundred fifty-two thousand, four hundred sixty-five".