26011661 has 8 divisors (see below), whose sum is σ = 28112280. Its totient is φ = 23925312.

The previous prime is 26011621. The next prime is 26011669. The reversal of 26011661 is 16611062.

It can be written as a sum of positive squares in 4 ways, for example, as 5851561 + 20160100 = 2419^2 + 4490^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26011661 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 (26011669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 7223.

It is an arithmetic number, because the mean of its divisors is an integer number (3514035).

Almost surely, 2^26011661 is an apocalyptic number.

It is an amenable number.

26011661 is a deficient number, since it is larger than the sum of its proper divisors (2100619).

26011661 is a wasteful number, since it uses less digits than its factorization.

26011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7135.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 26011661 is about 5100.1628405375. The cubic root of 26011661 is about 296.2938895374.

The spelling of 26011661 in words is "twenty-six million, eleven thousand, six hundred sixty-one".