261366242 has 8 divisors (see below), whose sum is σ = 412683600. Its totient is φ = 123805044.

The previous prime is 261366233. The next prime is 261366247. The reversal of 261366242 is 242663162.

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

It is a super-3 number, since 3×261366242³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261366199 and 261366208.

It is not an unprimeable number, because it can be changed into a prime (261366247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3438992 + ... + 3439067.

It is an arithmetic number, because the mean of its divisors is an integer number (51585450).

Almost surely, 2^261366242 is an apocalyptic number.

261366242 is a deficient number, since it is larger than the sum of its proper divisors (151317358).

261366242 is a wasteful number, since it uses less digits than its factorization.

261366242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6878080.

The product of its digits is 20736, while the sum is 32.

The square root of 261366242 is about 16166.8253531731. The cubic root of 261366242 is about 639.3664319254.

The spelling of 261366242 in words is "two hundred sixty-one million, three hundred sixty-six thousand, two hundred forty-two".