26681439489 has 4 divisors (see below), whose sum is σ = 35575252656. Its totient is φ = 17787626324.

The previous prime is 26681439481. The next prime is 26681439503. The reversal of 26681439489 is 98493418662.

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 26681439489 - 2³ = 26681439481 is a prime.

It is a super-2 number, since 2×26681439489² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26681439481) 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, 4446906579 + ... + 4446906584.

It is an arithmetic number, because the mean of its divisors is an integer number (8893813164).

Almost surely, 2^26681439489 is an apocalyptic number.

It is an amenable number.

26681439489 is a deficient number, since it is larger than the sum of its proper divisors (8893813167).

26681439489 is an equidigital number, since it uses as much as digits as its factorization.

26681439489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8893813166.

The product of its digits is 17915904, while the sum is 60.

The spelling of 26681439489 in words is "twenty-six billion, six hundred eighty-one million, four hundred thirty-nine thousand, four hundred eighty-nine".