26555681 has 2 divisors, whose sum is σ = 26555682. Its totient is φ = 26555680.

The previous prime is 26555671. The next prime is 26555687. The reversal of 26555681 is 18655562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15928081 + 10627600 = 3991^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 26555681 - 2¹⁰ = 26554657 is a prime.

It is a super-2 number, since 2×26555681² = 1410408386747522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26555687) 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 as a sum of consecutive naturals, namely, 13277840 + 13277841.

It is an arithmetic number, because the mean of its divisors is an integer number (13277841).

Almost surely, 2^26555681 is an apocalyptic number.

It is an amenable number.

26555681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26555681 is an equidigital number, since it uses as much as digits as its factorization.

26555681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 38.

The square root of 26555681 is about 5153.2204493889. The cubic root of 26555681 is about 298.3452636810.

The spelling of 26555681 in words is "twenty-six million, five hundred fifty-five thousand, six hundred eighty-one".