26404340553 has 10 divisors (see below), whose sum is σ = 39443521194. Its totient is φ = 17602893648.

The previous prime is 26404340549. The next prime is 26404340569. The reversal of 26404340553 is 35504340462.

26404340553 is a `hidden beast` number, since 2 + 64 + 0 + 4 + 3 + 40 + 553 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17831062089 + 8573278464 = 133533^2 + 92592^2 .

It is not a de Polignac number, because 26404340553 - 2² = 26404340549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26404340593) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 162989676 + ... + 162989837.

Almost surely, 2^26404340553 is an apocalyptic number.

It is an amenable number.

26404340553 is a deficient number, since it is larger than the sum of its proper divisors (13039180641).

26404340553 is an equidigital number, since it uses as much as digits as its factorization.

26404340553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325979525 (or 325979516 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Subtracting 26404340553 from its reverse (35504340462), we obtain a palindrome (9099999909).

The spelling of 26404340553 in words is "twenty-six billion, four hundred four million, three hundred forty thousand, five hundred fifty-three".