26661647 has 2 divisors, whose sum is σ = 26661648. Its totient is φ = 26661646.

The previous prime is 26661629. The next prime is 26661683. The reversal of 26661647 is 74616662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26661647 - 2⁸ = 26661391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26661647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26661847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13330823 + 13330824.

It is an arithmetic number, because the mean of its divisors is an integer number (13330824).

Almost surely, 2^26661647 is an apocalyptic number.

26661647 is a deficient number, since it is larger than the sum of its proper divisors (1).

26661647 is an equidigital number, since it uses as much as digits as its factorization.

26661647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 26661647 is about 5163.4917449338. The cubic root of 26661647 is about 298.7415692958.

The spelling of 26661647 in words is "twenty-six million, six hundred sixty-one thousand, six hundred forty-seven".