26220661 has 2 divisors, whose sum is σ = 26220662. Its totient is φ = 26220660.

The previous prime is 26220643. The next prime is 26220673. The reversal of 26220661 is 16602262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 9492561 = 4090^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 26220661 - 2⁵ = 26220629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26220631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110330 + 13110331.

It is an arithmetic number, because the mean of its divisors is an integer number (13110331).

Almost surely, 2^26220661 is an apocalyptic number.

It is an amenable number.

26220661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26220661 is an equidigital number, since it uses as much as digits as its factorization.

26220661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 26220661 is about 5120.6113892777. The cubic root of 26220661 is about 297.0853333610.

The spelling of 26220661 in words is "twenty-six million, two hundred twenty thousand, six hundred sixty-one".