26662866643 has 8 divisors (see below), whose sum is σ = 30901029120. Its totient is φ = 22531999560.

The previous prime is 26662866617. The next prime is 26662866673. The reversal of 26662866643 is 34666826662.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-26662866643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26662866673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26823313 + ... + 26824306.

It is an arithmetic number, because the mean of its divisors is an integer number (3862628640).

Almost surely, 2^26662866643 is an apocalyptic number.

26662866643 is a deficient number, since it is larger than the sum of its proper divisors (4238162477).

26662866643 is an equidigital number, since it uses as much as digits as its factorization.

26662866643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53647697.

The product of its digits is 17915904, while the sum is 55.

The spelling of 26662866643 in words is "twenty-six billion, six hundred sixty-two million, eight hundred sixty-six thousand, six hundred forty-three".