26664457801 has 2 divisors, whose sum is σ = 26664457802. Its totient is φ = 26664457800.

The previous prime is 26664457759. The next prime is 26664457837. The reversal of 26664457801 is 10875446662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26659052176 + 5405625 = 163276^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 26664457801 - 2⁹ = 26664457289 is a prime.

It is not a weakly prime, because it can be changed into another prime (26064457801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332228900 + 13332228901.

It is an arithmetic number, because the mean of its divisors is an integer number (13332228901).

Almost surely, 2^26664457801 is an apocalyptic number.

It is an amenable number.

26664457801 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664457801 is an equidigital number, since it uses as much as digits as its factorization.

26664457801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 26664457801 in words is "twenty-six billion, six hundred sixty-four million, four hundred fifty-seven thousand, eight hundred one".