26399898398688 has 96 divisors (see below), whose sum is σ = 69449519833344. Its totient is φ = 8780961057792.

The previous prime is 26399898398617. The next prime is 26399898398689. The reversal of 26399898398688 is 88689389899362.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×26399898398688² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (96).

It is a junction number, because it is equal to n+sod(n) for n = 26399898398595 and 26399898398604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26399898398689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110466781 + ... + 110705507.

It is an arithmetic number, because the mean of its divisors is an integer number (723432498264).

Almost surely, 2^{26399898398688} is an apocalyptic number.

It is an amenable number.

26399898398688 is an abundant number, since it is smaller than the sum of its proper divisors (43049621434656).

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

26399898398688 is a wasteful number, since it uses less digits than its factorization.

26399898398688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241224 (or 241216 counting only the distinct ones).

The product of its digits is 139314069504, while the sum is 96.

The spelling of 26399898398688 in words is "twenty-six trillion, three hundred ninety-nine billion, eight hundred ninety-eight million, three hundred ninety-eight thousand, six hundred eighty-eight".