26401388890 has 16 divisors (see below), whose sum is σ = 47993021640. Its totient is φ = 10455995200.

The previous prime is 26401388869. The next prime is 26401388921. The reversal of 26401388890 is 9888310462.

It can be written as a sum of positive squares in 4 ways, for example, as 25465457241 + 935931649 = 159579^2 + 30593^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13068985 + ... + 13071004.

Almost surely, 2^26401388890 is an apocalyptic number.

26401388890 is a deficient number, since it is larger than the sum of its proper divisors (21591632750).

26401388890 is a wasteful number, since it uses less digits than its factorization.

26401388890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26140097.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 26401388890 in words is "twenty-six billion, four hundred one million, three hundred eighty-eight thousand, eight hundred ninety".