26985717009 has 6 divisors (see below), whose sum is σ = 38979369026. Its totient is φ = 17990478000.

The previous prime is 26985717001. The next prime is 26985717029. The reversal of 26985717009 is 90071758962.

26985717009 is a `hidden beast` number, since 2 + 69 + 8 + 571 + 7 + 0 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24972848784 + 2012868225 = 158028^2 + 44865^2 .

It is not a de Polignac number, because 26985717009 - 2³ = 26985717001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26985717001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1499206492 + ... + 1499206509.

Almost surely, 2^26985717009 is an apocalyptic number.

It is an amenable number.

26985717009 is a deficient number, since it is larger than the sum of its proper divisors (11993652017).

26985717009 is a wasteful number, since it uses less digits than its factorization.

26985717009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998413007 (or 2998413004 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 26985717009 in words is "twenty-six billion, nine hundred eighty-five million, seven hundred seventeen thousand, nine".