26121644244 has 18 divisors (see below), whose sum is σ = 66029711930. Its totient is φ = 8707214736.

The previous prime is 26121644243. The next prime is 26121644261. The reversal of 26121644244 is 44244612162.

26121644244 is a `hidden beast` number, since 2 + 6 + 1 + 2 + 1 + 644 + 2 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22496400144 + 3625244100 = 149988^2 + 60210^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 725601229 = 26121644244 / (2 + 6 + 1 + 2 + 1 + 6 + 4 + 4 + 2 + 4 + 4).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 26121644199 and 26121644208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26121644243) 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, 362800579 + ... + 362800650.

Almost surely, 2^26121644244 is an apocalyptic number.

It is an amenable number.

26121644244 is an abundant number, since it is smaller than the sum of its proper divisors (39908067686).

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

26121644244 is a wasteful number, since it uses less digits than its factorization.

26121644244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725601239 (or 725601234 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The spelling of 26121644244 in words is "twenty-six billion, one hundred twenty-one million, six hundred forty-four thousand, two hundred forty-four".