26149800181 has 2 divisors, whose sum is σ = 26149800182. Its totient is φ = 26149800180.

The previous prime is 26149800167. The next prime is 26149800211. The reversal of 26149800181 is 18100894162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25803281956 + 346518225 = 160634^2 + 18615^2 .

It is a cyclic number.

It is not a de Polignac number, because 26149800181 - 2¹³ = 26149791989 is a prime.

It is a super-2 number, since 2×26149800181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26149800121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13074900090 + 13074900091.

It is an arithmetic number, because the mean of its divisors is an integer number (13074900091).

Almost surely, 2^26149800181 is an apocalyptic number.

It is an amenable number.

26149800181 is a deficient number, since it is larger than the sum of its proper divisors (1).

26149800181 is an equidigital number, since it uses as much as digits as its factorization.

26149800181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 40.

The spelling of 26149800181 in words is "twenty-six billion, one hundred forty-nine million, eight hundred thousand, one hundred eighty-one".