26115206404 has 135 divisors (see below), whose sum is σ = 57225950943. Its totient is φ = 10425268224.

The previous prime is 26115206401. The next prime is 26115206443. The reversal of 26115206404 is 40460251162.

It is a happy number.

The square root of 26115206404 is 161602.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1528966404 + 24586240000 = 39102^2 + 156800^2 .

It is a super-2 number, since 2×26115206404² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26115206401) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 269228884 + ... + 269228980.

Almost surely, 2^26115206404 is an apocalyptic number.

26115206404 is the 161602-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26115206404

26115206404 is an abundant number, since it is smaller than the sum of its proper divisors (31110744539).

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

26115206404 is an frugal number, since it uses more digits than its factorization.

26115206404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 26115206404 its reverse (40460251162), we get a palindrome (66575457566).

It can be divided in two parts, 2611520 and 6404, that added together give a square (2617924 = 1618²).

The spelling of 26115206404 in words is "twenty-six billion, one hundred fifteen million, two hundred six thousand, four hundred four".