26216681 has 2 divisors, whose sum is σ = 26216682. Its totient is φ = 26216680.

The previous prime is 26216677. The next prime is 26216747. The reversal of 26216681 is 18661262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 11162281 = 3880^2 + 3341^2 .

It is a cyclic number.

It is not a de Polignac number, because 26216681 - 2² = 26216677 is a prime.

It is a super-2 number, since 2×26216681² = 1374628725311522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26216611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13108340 + 13108341.

It is an arithmetic number, because the mean of its divisors is an integer number (13108341).

Almost surely, 2^26216681 is an apocalyptic number.

It is an amenable number.

26216681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26216681 is an equidigital number, since it uses as much as digits as its factorization.

26216681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 26216681 is about 5120.2227490608. Note that the first 3 decimals coincide. The cubic root of 26216681 is about 297.0703012017.

The spelling of 26216681 in words is "twenty-six million, two hundred sixteen thousand, six hundred eighty-one".