26604406721 has 2 divisors, whose sum is σ = 26604406722. Its totient is φ = 26604406720.

The previous prime is 26604406711. The next prime is 26604406723. The reversal of 26604406721 is 12760440662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17805966721 + 8798440000 = 133439^2 + 93800^2 .

It is a cyclic number.

It is not a de Polignac number, because 26604406721 - 2²² = 26600212417 is a prime.

Together with 26604406723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26604406723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13302203360 + 13302203361.

It is an arithmetic number, because the mean of its divisors is an integer number (13302203361).

Almost surely, 2^26604406721 is an apocalyptic number.

It is an amenable number.

26604406721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26604406721 is an equidigital number, since it uses as much as digits as its factorization.

26604406721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 26604406721 in words is "twenty-six billion, six hundred four million, four hundred six thousand, seven hundred twenty-one".