26661671 has 4 divisors (see below), whose sum is σ = 26730600. Its totient is φ = 26592744.

The previous prime is 26661647. The next prime is 26661683. The reversal of 26661671 is 17616662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26661671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26661601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33881 + ... + 34658.

It is an arithmetic number, because the mean of its divisors is an integer number (6682650).

Almost surely, 2^26661671 is an apocalyptic number.

26661671 is a deficient number, since it is larger than the sum of its proper divisors (68929).

26661671 is an equidigital number, since it uses as much as digits as its factorization.

26661671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68928.

The product of its digits is 18144, while the sum is 35.

The square root of 26661671 is about 5163.4940689421. The cubic root of 26661671 is about 298.7416589351.

The spelling of 26661671 in words is "twenty-six million, six hundred sixty-one thousand, six hundred seventy-one".