26138665388 has 18 divisors (see below), whose sum is σ = 50279127948. Its totient is φ = 11881211320.

The previous prime is 26138665349. The next prime is 26138665409. The reversal of 26138665388 is 88356683162.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27002270 + ... + 27003237.

It is an arithmetic number, because the mean of its divisors is an integer number (2793284886).

Almost surely, 2^26138665388 is an apocalyptic number.

It is an amenable number.

26138665388 is a deficient number, since it is larger than the sum of its proper divisors (24140462560).

26138665388 is a wasteful number, since it uses less digits than its factorization.

26138665388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54005533 (or 54005520 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 56.

The spelling of 26138665388 in words is "twenty-six billion, one hundred thirty-eight million, six hundred sixty-five thousand, three hundred eighty-eight".