26814778129 has 4 divisors (see below), whose sum is σ = 26931873460. Its totient is φ = 26697682800.

The previous prime is 26814778127. The next prime is 26814778157. The reversal of 26814778129 is 92187741862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92187741862 = 2 ⋅46093870931.

It can be written as a sum of positive squares in 2 ways, for example, as 16378112529 + 10436665600 = 127977^2 + 102160^2 .

It is a cyclic number.

It is not a de Polignac number, because 26814778129 - 2¹ = 26814778127 is a prime.

It is a super-2 number, since 2×26814778129² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26814778129.

It is not an unprimeable number, because it can be changed into a prime (26814778127) 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, 58547322 + ... + 58547779.

It is an arithmetic number, because the mean of its divisors is an integer number (6732968365).

Almost surely, 2^26814778129 is an apocalyptic number.

It is an amenable number.

26814778129 is a deficient number, since it is larger than the sum of its proper divisors (117095331).

26814778129 is a wasteful number, since it uses less digits than its factorization.

26814778129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117095330.

The product of its digits is 2709504, while the sum is 55.

The spelling of 26814778129 in words is "twenty-six billion, eight hundred fourteen million, seven hundred seventy-eight thousand, one hundred twenty-nine".