26440663505 has 4 divisors (see below), whose sum is σ = 31728796212. Its totient is φ = 21152530800.

The previous prime is 26440663477. The next prime is 26440663507. The reversal of 26440663505 is 50536604462.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8195137729 + 18245525776 = 90527^2 + 135076^2 .

It is not a de Polignac number, because 26440663505 - 2¹⁰ = 26440662481 is a prime.

It is a super-3 number, since 3×26440663505³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26440663507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2644066346 + ... + 2644066355.

It is an arithmetic number, because the mean of its divisors is an integer number (7932199053).

Almost surely, 2^26440663505 is an apocalyptic number.

It is an amenable number.

26440663505 is a deficient number, since it is larger than the sum of its proper divisors (5288132707).

26440663505 is an equidigital number, since it uses as much as digits as its factorization.

26440663505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288132706.

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 26440663505 in words is "twenty-six billion, four hundred forty million, six hundred sixty-three thousand, five hundred five".