26664552613 has 2 divisors, whose sum is σ = 26664552614. Its totient is φ = 26664552612.

The previous prime is 26664552569. The next prime is 26664552631. The reversal of 26664552613 is 31625546662.

Together with next prime (26664552631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26334149284 + 330403329 = 162278^2 + 18177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26664552613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26664552653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332276306 + 13332276307.

It is an arithmetic number, because the mean of its divisors is an integer number (13332276307).

Almost surely, 2^26664552613 is an apocalyptic number.

It is an amenable number.

26664552613 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664552613 is an equidigital number, since it uses as much as digits as its factorization.

26664552613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 46.

The spelling of 26664552613 in words is "twenty-six billion, six hundred sixty-four million, five hundred fifty-two thousand, six hundred thirteen".