26851666925 has 12 divisors (see below), whose sum is σ = 33924296340. Its totient is φ = 21076024320.

The previous prime is 26851666909. The next prime is 26851666927. The reversal of 26851666925 is 52966615862.

It can be written as a sum of positive squares in 6 ways, for example, as 1750334569 + 25101332356 = 41837^2 + 158434^2 .

It is not a de Polignac number, because 26851666925 - 2⁴ = 26851666909 is a prime.

It is a super-2 number, since 2×26851666925² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26851666927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10131380 + ... + 10134029.

It is an arithmetic number, because the mean of its divisors is an integer number (2827024695).

Almost surely, 2^26851666925 is an apocalyptic number.

26851666925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

26851666925 is a deficient number, since it is larger than the sum of its proper divisors (7072629415).

26851666925 is a wasteful number, since it uses less digits than its factorization.

26851666925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20265472 (or 20265467 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 56.

The spelling of 26851666925 in words is "twenty-six billion, eight hundred fifty-one million, six hundred sixty-six thousand, nine hundred twenty-five".