26117009549 has 12 divisors (see below), whose sum is σ = 27126690588. Its totient is φ = 25143390720.

The previous prime is 26117009539. The next prime is 26117009557. The reversal of 26117009549 is 94590071162.

It can be written as a sum of positive squares in 2 ways, for example, as 8165833225 + 17951176324 = 90365^2 + 133982^2 .

It is not a de Polignac number, because 26117009549 - 2⁴ = 26117009533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26117009539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115067 + ... + 255879.

It is an arithmetic number, because the mean of its divisors is an integer number (2260557549).

Almost surely, 2^26117009549 is an apocalyptic number.

It is an amenable number.

26117009549 is a deficient number, since it is larger than the sum of its proper divisors (1009681039).

26117009549 is a wasteful number, since it uses less digits than its factorization.

26117009549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141068 (or 141037 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 26117009549 in words is "twenty-six billion, one hundred seventeen million, nine thousand, five hundred forty-nine".