261325663 has 8 divisors (see below), whose sum is σ = 270164048. Its totient is φ = 252612864.

The previous prime is 261325657. The next prime is 261325679. The reversal of 261325663 is 366523162.

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

It is a cyclic number.

It is not a de Polignac number, because 261325663 - 2⁹ = 261325151 is a prime.

It is a super-2 number, since 2×261325663² = 136582204284779138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261325613) 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 7 ways as a sum of consecutive naturals, for example, 27156 + ... + 35497.

It is an arithmetic number, because the mean of its divisors is an integer number (33770506).

Almost surely, 2^261325663 is an apocalyptic number.

261325663 is a deficient number, since it is larger than the sum of its proper divisors (8838385).

261325663 is an equidigital number, since it uses as much as digits as its factorization.

261325663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62793.

The product of its digits is 38880, while the sum is 34.

The square root of 261325663 is about 16165.5702961572. The cubic root of 261325663 is about 639.3333414581. Note that the first 4 decimals are identical.

The spelling of 261325663 in words is "two hundred sixty-one million, three hundred twenty-five thousand, six hundred sixty-three".