26126640109 has 2 divisors, whose sum is σ = 26126640110. Its totient is φ = 26126640108.

The previous prime is 26126640103. The next prime is 26126640119. The reversal of 26126640109 is 90104662162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25962876900 + 163763209 = 161130^2 + 12797^2 .

It is a cyclic number.

It is not a de Polignac number, because 26126640109 - 2³³ = 17536705517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26126640103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13063320054 + 13063320055.

It is an arithmetic number, because the mean of its divisors is an integer number (13063320055).

Almost surely, 2^26126640109 is an apocalyptic number.

It is an amenable number.

26126640109 is a deficient number, since it is larger than the sum of its proper divisors (1).

26126640109 is an equidigital number, since it uses as much as digits as its factorization.

26126640109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 26126640109 in words is "twenty-six billion, one hundred twenty-six million, six hundred forty thousand, one hundred nine".