26578661 has 2 divisors, whose sum is σ = 26578662. Its totient is φ = 26578660.

The previous prime is 26578631. The next prime is 26578697. The reversal of 26578661 is 16687562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23668225 + 2910436 = 4865^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 26578661 - 2⁶ = 26578597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26578621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13289330 + 13289331.

It is an arithmetic number, because the mean of its divisors is an integer number (13289331).

Almost surely, 2^26578661 is an apocalyptic number.

It is an amenable number.

26578661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26578661 is an equidigital number, since it uses as much as digits as its factorization.

26578661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 26578661 is about 5155.4496409140. The cubic root of 26578661 is about 298.4312967160.

The spelling of 26578661 in words is "twenty-six million, five hundred seventy-eight thousand, six hundred sixty-one".