26671672721 has 2 divisors, whose sum is σ = 26671672722. Its totient is φ = 26671672720.

The previous prime is 26671672711. The next prime is 26671672751. The reversal of 26671672721 is 12727617662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21970650625 + 4701022096 = 148225^2 + 68564^2 .

It is a cyclic number.

It is not a de Polignac number, because 26671672721 - 2³⁴ = 9491803537 is a prime.

It is a super-2 number, since 2×26671672721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26671672711) 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, 13335836360 + 13335836361.

It is an arithmetic number, because the mean of its divisors is an integer number (13335836361).

Almost surely, 2^26671672721 is an apocalyptic number.

It is an amenable number.

26671672721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26671672721 is an equidigital number, since it uses as much as digits as its factorization.

26671672721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 47.

The spelling of 26671672721 in words is "twenty-six billion, six hundred seventy-one million, six hundred seventy-two thousand, seven hundred twenty-one".