260985708457 has 4 divisors (see below), whose sum is σ = 265264162756. Its totient is φ = 256707254160.

The previous prime is 260985708439. The next prime is 260985708463. The reversal of 260985708457 is 754807589062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754807589062 = 2 ⋅377403794531.

It can be written as a sum of positive squares in 2 ways, for example, as 112942372761 + 148043335696 = 336069^2 + 384764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260985708457 is a prime.

It is a super-2 number, since 2×260985708457² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61), and also a Moran number because the ratio is a prime number: 4278454237 = 260985708457 / (2 + 6 + 0 + 9 + 8 + 5 + 7 + 0 + 8 + 4 + 5 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 260985708395 and 260985708404.

It is not an unprimeable number, because it can be changed into a prime (260985708437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139227058 + ... + 2139227179.

It is an arithmetic number, because the mean of its divisors is an integer number (66316040689).

Almost surely, 2^260985708457 is an apocalyptic number.

It is an amenable number.

260985708457 is a deficient number, since it is larger than the sum of its proper divisors (4278454299).

260985708457 is an equidigital number, since it uses as much as digits as its factorization.

260985708457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278454298.

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 260985708457 in words is "two hundred sixty billion, nine hundred eighty-five million, seven hundred eight thousand, four hundred fifty-seven".