26128180805 has 16 divisors (see below), whose sum is σ = 31803238704. Its totient is φ = 20603289600.

The previous prime is 26128180801. The next prime is 26128180873. The reversal of 26128180805 is 50808182162.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 23639044 + 26104541761 = 4862^2 + 161569^2 .

It is not a de Polignac number, because 26128180805 - 2² = 26128180801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26128180801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 583205 + ... + 626405.

It is an arithmetic number, because the mean of its divisors is an integer number (1987702419).

Almost surely, 2^26128180805 is an apocalyptic number.

It is an amenable number.

26128180805 is a deficient number, since it is larger than the sum of its proper divisors (5675057899).

26128180805 is a wasteful number, since it uses less digits than its factorization.

26128180805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44936.

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 26128180805 in words is "twenty-six billion, one hundred twenty-eight million, one hundred eighty thousand, eight hundred five".