26680661 has 4 divisors (see below), whose sum is σ = 30492192. Its totient is φ = 22869132.

The previous prime is 26680657. The next prime is 26680679. The reversal of 26680661 is 16608662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26680661 - 2² = 26680657 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 (26680601) 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, 1905755 + ... + 1905768.

It is an arithmetic number, because the mean of its divisors is an integer number (7623048).

Almost surely, 2^26680661 is an apocalyptic number.

It is an amenable number.

26680661 is a deficient number, since it is larger than the sum of its proper divisors (3811531).

26680661 is an equidigital number, since it uses as much as digits as its factorization.

26680661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811530.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 26680661 is about 5165.3326127172. The cubic root of 26680661 is about 298.8125691909.

The spelling of 26680661 in words is "twenty-six million, six hundred eighty thousand, six hundred sixty-one".