26956378129 has 4 divisors (see below), whose sum is σ = 27096048676. Its totient is φ = 26816707584.

The previous prime is 26956378123. The next prime is 26956378153. The reversal of 26956378129 is 92187365962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92187365962 = 2 ⋅46093682981.

It can be written as a sum of positive squares in 2 ways, for example, as 4109451025 + 22846927104 = 64105^2 + 151152^2 .

It is a cyclic number.

It is not a de Polignac number, because 26956378129 - 2¹⁷ = 26956247057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26956378123) 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, 69834984 + ... + 69835369.

It is an arithmetic number, because the mean of its divisors is an integer number (6774012169).

Almost surely, 2^26956378129 is an apocalyptic number.

It is an amenable number.

26956378129 is a deficient number, since it is larger than the sum of its proper divisors (139670547).

26956378129 is a wasteful number, since it uses less digits than its factorization.

26956378129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139670546.

The product of its digits is 9797760, while the sum is 58.

The spelling of 26956378129 in words is "twenty-six billion, nine hundred fifty-six million, three hundred seventy-eight thousand, one hundred twenty-nine".