26664431 has 2 divisors, whose sum is σ = 26664432. Its totient is φ = 26664430.

The previous prime is 26664419. The next prime is 26664439. The reversal of 26664431 is 13446662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26664431 - 2¹⁴ = 26648047 is a prime.

It is a super-2 number, since 2×26664431² = 1421983761107522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26664439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332215 + 13332216.

It is an arithmetic number, because the mean of its divisors is an integer number (13332216).

Almost surely, 2^26664431 is an apocalyptic number.

26664431 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664431 is an equidigital number, since it uses as much as digits as its factorization.

26664431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 26664431 is about 5163.7613229118. The cubic root of 26664431 is about 298.7519670978.

The spelling of 26664431 in words is "twenty-six million, six hundred sixty-four thousand, four hundred thirty-one".