26681682457 has 4 divisors (see below), whose sum is σ = 26682350800. Its totient is φ = 26681014116.

The previous prime is 26681682451. The next prime is 26681682479. The reversal of 26681682457 is 75428618662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26681682457 - 2¹⁹ = 26681158169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26681682398 and 26681682407.

It is not an unprimeable number, because it can be changed into a prime (26681682451) 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, 270207 + ... + 355492.

It is an arithmetic number, because the mean of its divisors is an integer number (6670587700).

Almost surely, 2^26681682457 is an apocalyptic number.

It is an amenable number.

26681682457 is a deficient number, since it is larger than the sum of its proper divisors (668343).

26681682457 is an equidigital number, since it uses as much as digits as its factorization.

26681682457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668342.

The product of its digits is 7741440, while the sum is 55.

The spelling of 26681682457 in words is "twenty-six billion, six hundred eighty-one million, six hundred eighty-two thousand, four hundred fifty-seven".