26664536388 has 144 divisors (see below), whose sum is σ = 78812395200. Its totient is φ = 6968505600.

The previous prime is 26664536377. The next prime is 26664536389. The reversal of 26664536388 is 88363546662.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (26664536389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 282838 + ... + 365138.

It is an arithmetic number, because the mean of its divisors is an integer number (547308300).

Almost surely, 2^26664536388 is an apocalyptic number.

26664536388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26664536388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39406197600).

26664536388 is an abundant number, since it is smaller than the sum of its proper divisors (52147858812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26664536388 is a wasteful number, since it uses less digits than its factorization.

26664536388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82370 (or 82361 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 57.

The spelling of 26664536388 in words is "twenty-six billion, six hundred sixty-four million, five hundred thirty-six thousand, three hundred eighty-eight".