26629661 has 2 divisors, whose sum is σ = 26629662. Its totient is φ = 26629660.

The previous prime is 26629657. The next prime is 26629663. The reversal of 26629661 is 16692662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26327161 + 302500 = 5131^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 26629661 - 2² = 26629657 is a prime.

Together with 26629663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26629663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13314830 + 13314831.

It is an arithmetic number, because the mean of its divisors is an integer number (13314831).

Almost surely, 2^26629661 is an apocalyptic number.

It is an amenable number.

26629661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26629661 is an equidigital number, since it uses as much as digits as its factorization.

26629661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 26629661 is about 5160.3934927484. The cubic root of 26629661 is about 298.6220546530.

The spelling of 26629661 in words is "twenty-six million, six hundred twenty-nine thousand, six hundred sixty-one".