26646879887 has 4 divisors (see below), whose sum is σ = 26647748400. Its totient is φ = 26646011376.

The previous prime is 26646879869. The next prime is 26646879893. The reversal of 26646879887 is 78897864662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78897864662 = 2 ⋅39448932331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26646879887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26646879887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26646875887) 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, 386483 + ... + 450180.

It is an arithmetic number, because the mean of its divisors is an integer number (6661937100).

Almost surely, 2^26646879887 is an apocalyptic number.

26646879887 is a deficient number, since it is larger than the sum of its proper divisors (868513).

26646879887 is an equidigital number, since it uses as much as digits as its factorization.

26646879887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868512.

The product of its digits is 390168576, while the sum is 71.

The spelling of 26646879887 in words is "twenty-six billion, six hundred forty-six million, eight hundred seventy-nine thousand, eight hundred eighty-seven".