260991645 has 8 divisors (see below), whose sum is σ = 417586656. Its totient is φ = 139195536.

The previous prime is 260991641. The next prime is 260991719. The reversal of 260991645 is 546199062.

It is a happy number.

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

It is not a de Polignac number, because 260991645 - 2² = 260991641 is a prime.

It is a super-3 number, since 3×260991645³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 260991597 and 260991606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260991641) 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, 8699707 + ... + 8699736.

It is an arithmetic number, because the mean of its divisors is an integer number (52198332).

Almost surely, 2^260991645 is an apocalyptic number.

It is an amenable number.

260991645 is a deficient number, since it is larger than the sum of its proper divisors (156595011).

260991645 is a wasteful number, since it uses less digits than its factorization.

260991645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17399451.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 260991645 is about 16155.2358385757. The cubic root of 260991645 is about 639.0608335970.

The spelling of 260991645 in words is "two hundred sixty million, nine hundred ninety-one thousand, six hundred forty-five".