265781417849 has 16 divisors (see below), whose sum is σ = 273684014352. Its totient is φ = 257987678208.

The previous prime is 265781417827. The next prime is 265781417873. The reversal of 265781417849 is 948714187562.

It can be written as a sum of positive squares in 8 ways, for example, as 2776552249 + 263004865600 = 52693^2 + 512840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265781417849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 265781417791 and 265781417800.

It is not an unprimeable number, because it can be changed into a prime (265781417819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18155837 + ... + 18170469.

It is an arithmetic number, because the mean of its divisors is an integer number (17105250897).

Almost surely, 2^265781417849 is an apocalyptic number.

It is an amenable number.

265781417849 is a deficient number, since it is larger than the sum of its proper divisors (7902596503).

265781417849 is a wasteful number, since it uses less digits than its factorization.

265781417849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18316.

The product of its digits is 27095040, while the sum is 62.

The spelling of 265781417849 in words is "two hundred sixty-five billion, seven hundred eighty-one million, four hundred seventeen thousand, eight hundred forty-nine".