26646346621 has 8 divisors (see below), whose sum is σ = 27322040664. Its totient is φ = 25977057600.

The previous prime is 26646346619. The next prime is 26646346627. The reversal of 26646346621 is 12664364662.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10054072900 + 16592273721 = 100270^2 + 128811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26646346621 - 2¹ = 26646346619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26646346627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592830 + ... + 1609471.

It is an arithmetic number, because the mean of its divisors is an integer number (3415255083).

Almost surely, 2^26646346621 is an apocalyptic number.

It is an amenable number.

26646346621 is a deficient number, since it is larger than the sum of its proper divisors (675694043).

26646346621 is a wasteful number, since it uses less digits than its factorization.

26646346621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202511.

The product of its digits is 1492992, while the sum is 46.

The spelling of 26646346621 in words is "twenty-six billion, six hundred forty-six million, three hundred forty-six thousand, six hundred twenty-one".