261330025 has 48 divisors (see below), whose sum is σ = 374261760. Its totient is φ = 179150400.

The previous prime is 261330019. The next prime is 261330029. The reversal of 261330025 is 520033162.

It is not a de Polignac number, because 261330025 - 2⁵ = 261329993 is a prime.

It is a super-3 number, since 3×261330025³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261329978 and 261330005.

It is not an unprimeable number, because it can be changed into a prime (261330029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 499414 + ... + 499936.

It is an arithmetic number, because the mean of its divisors is an integer number (7797120).

Almost surely, 2^261330025 is an apocalyptic number.

261330025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261330025 is a deficient number, since it is larger than the sum of its proper divisors (112931735).

261330025 is a wasteful number, since it uses less digits than its factorization.

261330025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 261330025 is about 16165.7052119603. The cubic root of 261330025 is about 639.3368986499.

Adding to 261330025 its reverse (520033162), we get a palindrome (781363187).

The spelling of 261330025 in words is "two hundred sixty-one million, three hundred thirty thousand, twenty-five".