26680691 has 2 divisors, whose sum is σ = 26680692. Its totient is φ = 26680690.

The previous prime is 26680681. The next prime is 26680711. The reversal of 26680691 is 19608662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26680691 - 2¹⁴ = 26664307 is a prime.

It is not a weakly prime, because it can be changed into another prime (26680601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13340345 + 13340346.

It is an arithmetic number, because the mean of its divisors is an integer number (13340346).

Almost surely, 2^26680691 is an apocalyptic number.

26680691 is a deficient number, since it is larger than the sum of its proper divisors (1).

26680691 is an equidigital number, since it uses as much as digits as its factorization.

26680691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 26680691 is about 5165.3355166920. The cubic root of 26680691 is about 298.8126811868.

The spelling of 26680691 in words is "twenty-six million, six hundred eighty thousand, six hundred ninety-one".