26181778418 has 16 divisors (see below), whose sum is σ = 39731935320. Its totient is φ = 12938400000.

The previous prime is 26181778409. The next prime is 26181778457. The reversal of 26181778418 is 81487718162.

It can be written as a sum of positive squares in 4 ways, for example, as 25531885369 + 649893049 = 159787^2 + 25493^2 .

It is a super-2 number, since 2×26181778418² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26181778418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62333 + ... + 237168.

Almost surely, 2^26181778418 is an apocalyptic number.

26181778418 is a deficient number, since it is larger than the sum of its proper divisors (13550156902).

26181778418 is a wasteful number, since it uses less digits than its factorization.

26181778418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300013.

The product of its digits is 1204224, while the sum is 53.

The spelling of 26181778418 in words is "twenty-six billion, one hundred eighty-one million, seven hundred seventy-eight thousand, four hundred eighteen".