26640606644 has 12 divisors (see below), whose sum is σ = 46622228100. Its totient is φ = 13319970048.

The previous prime is 26640606637. The next prime is 26640606647. The reversal of 26640606644 is 44660604662.

It can be written as a sum of positive squares in 2 ways, for example, as 11366118544 + 15274488100 = 106612^2 + 123590^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26640606595 and 26640606604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640606647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216062 + ... + 316170.

It is an arithmetic number, because the mean of its divisors is an integer number (3885185675).

Almost surely, 2^26640606644 is an apocalyptic number.

It is an amenable number.

26640606644 is a deficient number, since it is larger than the sum of its proper divisors (19981621456).

26640606644 is a wasteful number, since it uses less digits than its factorization.

26640606644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166642 (or 166640 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 44.

The spelling of 26640606644 in words is "twenty-six billion, six hundred forty million, six hundred six thousand, six hundred forty-four".