26138548989 has 32 divisors (see below), whose sum is σ = 44335376640. Its totient is φ = 14909438016.

The previous prime is 26138548949. The next prime is 26138549023. The reversal of 26138548989 is 98984583162.

26138548989 is a `hidden beast` number, since 2 + 6 + 1 + 3 + 8 + 548 + 9 + 89 = 666.

It is not a de Polignac number, because 26138548989 - 2²⁵ = 26104994557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26138548949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18874 + ... + 229419.

It is an arithmetic number, because the mean of its divisors is an integer number (1385480520).

Almost surely, 2^26138548989 is an apocalyptic number.

It is an amenable number.

26138548989 is a deficient number, since it is larger than the sum of its proper divisors (18196827651).

26138548989 is a wasteful number, since it uses less digits than its factorization.

26138548989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248866 (or 248860 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The spelling of 26138548989 in words is "twenty-six billion, one hundred thirty-eight million, five hundred forty-eight thousand, nine hundred eighty-nine".