172826409881 has 2 divisors, whose sum is σ = 172826409882. Its totient is φ = 172826409880.

The previous prime is 172826409869. The next prime is 172826409883. The reversal of 172826409881 is 188904628271.

172826409881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168353475481 + 4472934400 = 410309^2 + 66880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172826409881 is a prime.

It is a super-2 number, since 2×172826409881² (a number of 23 digits) contains 22 as substring.

Together with 172826409883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172826409883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86413204940 + 86413204941.

It is an arithmetic number, because the mean of its divisors is an integer number (86413204941).

Almost surely, 2^172826409881 is an apocalyptic number.

It is an amenable number.

172826409881 is a deficient number, since it is larger than the sum of its proper divisors (1).

172826409881 is an equidigital number, since it uses as much as digits as its factorization.

172826409881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 56.

The spelling of 172826409881 in words is "one hundred seventy-two billion, eight hundred twenty-six million, four hundred nine thousand, eight hundred eighty-one".