26648666684661 has 32 divisors (see below), whose sum is σ = 42121055933440. Its totient is φ = 14669925427584.

The previous prime is 26648666684659. The next prime is 26648666684671. The reversal of 26648666684661 is 16648666684662.

It is not a de Polignac number, because 26648666684661 - 2¹ = 26648666684659 is a prime.

It is a super-2 number, since 2×26648666684661² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26648666684641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202065991 + ... + 202197828.

It is an arithmetic number, because the mean of its divisors is an integer number (1316282997920).

Almost surely, 2^{26648666684661} is an apocalyptic number.

26648666684661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26648666684661 is a deficient number, since it is larger than the sum of its proper divisors (15472389248779).

26648666684661 is a wasteful number, since it uses less digits than its factorization.

26648666684661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404263945.

The product of its digits is 3439853568, while the sum is 75.

Subtracting from 26648666684661 its reverse (16648666684662), we obtain a palindrome (9999999999999).

The spelling of 26648666684661 in words is "twenty-six trillion, six hundred forty-eight billion, six hundred sixty-six million, six hundred eighty-four thousand, six hundred sixty-one".