26340405666 has 8 divisors (see below), whose sum is σ = 52680811344. Its totient is φ = 8780135220.

The previous prime is 26340405631. The next prime is 26340405683. The reversal of 26340405666 is 66650404362.

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

26340405666 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2195033800 + ... + 2195033811.

It is an arithmetic number, because the mean of its divisors is an integer number (6585101418).

Almost surely, 2^26340405666 is an apocalyptic number.

26340405666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26340405666 is a wasteful number, since it uses less digits than its factorization.

26340405666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390067616.

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 26340405666 in words is "twenty-six billion, three hundred forty million, four hundred five thousand, six hundred sixty-six".