26617545389 has 2 divisors, whose sum is σ = 26617545390. Its totient is φ = 26617545388.

The previous prime is 26617545377. The next prime is 26617545443. The reversal of 26617545389 is 98354571662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26481052900 + 136492489 = 162730^2 + 11683^2 .

It is a cyclic number.

It is not a de Polignac number, because 26617545389 - 2⁴ = 26617545373 is a prime.

It is a super-2 number, since 2×26617545389² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26617545319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13308772694 + 13308772695.

It is an arithmetic number, because the mean of its divisors is an integer number (13308772695).

Almost surely, 2^26617545389 is an apocalyptic number.

It is an amenable number.

26617545389 is a deficient number, since it is larger than the sum of its proper divisors (1).

26617545389 is an equidigital number, since it uses as much as digits as its factorization.

26617545389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 56.

The spelling of 26617545389 in words is "twenty-six billion, six hundred seventeen million, five hundred forty-five thousand, three hundred eighty-nine".