26611661 has 2 divisors, whose sum is σ = 26611662. Its totient is φ = 26611660.

The previous prime is 26611643. The next prime is 26611687. The reversal of 26611661 is 16611662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 37636 = 5155^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 26611661 - 2⁶ = 26611597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26611601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13305830 + 13305831.

It is an arithmetic number, because the mean of its divisors is an integer number (13305831).

Almost surely, 2^26611661 is an apocalyptic number.

It is an amenable number.

26611661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26611661 is an equidigital number, since it uses as much as digits as its factorization.

26611661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 26611661 is about 5158.6491448828. The cubic root of 26611661 is about 298.5547561553.

Subtracting from 26611661 its reverse (16611662), we obtain a palindrome (9999999).

It can be divided in two parts, 26611 and 661, that added together give a palindrome (27272).

The spelling of 26611661 in words is "twenty-six million, six hundred eleven thousand, six hundred sixty-one".