260420783681 has 4 divisors (see below), whose sum is σ = 260565383364. Its totient is φ = 260276184000.

The previous prime is 260420783663. The next prime is 260420783699. The reversal of 260420783681 is 186387024062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186387024062 = 2 ⋅93193512031.

It is an interprime number because it is at equal distance from previous prime (260420783663) and next prime (260420783699).

It can be written as a sum of positive squares in 2 ways, for example, as 28906800400 + 231513983281 = 170020^2 + 481159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260420783681 is a prime.

It is a super-3 number, since 3×260420783681³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260420783621) 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 3 ways as a sum of consecutive naturals, for example, 72297140 + ... + 72300741.

It is an arithmetic number, because the mean of its divisors is an integer number (65141345841).

Almost surely, 2^260420783681 is an apocalyptic number.

It is an amenable number.

260420783681 is a deficient number, since it is larger than the sum of its proper divisors (144599683).

260420783681 is a wasteful number, since it uses less digits than its factorization.

260420783681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144599682.

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 260420783681 in words is "two hundred sixty billion, four hundred twenty million, seven hundred eighty-three thousand, six hundred eighty-one".