26399898398687 has 16 divisors (see below), whose sum is σ = 30325642513920. Its totient is φ = 22729277318400.

The previous prime is 26399898398617. The next prime is 26399898398689. The reversal of 26399898398687 is 78689389899362.

It is not a de Polignac number, because 26399898398687 - 2¹² = 26399898394591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26399898398687.

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 (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20133143 + ... + 21404280.

It is an arithmetic number, because the mean of its divisors is an integer number (1895352657120).

Almost surely, 2^{26399898398687} is an apocalyptic number.

26399898398687 is a deficient number, since it is larger than the sum of its proper divisors (3925744115233).

26399898398687 is a wasteful number, since it uses less digits than its factorization.

26399898398687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41540494.

The product of its digits is 121899810816, while the sum is 95.

The spelling of 26399898398687 in words is "twenty-six trillion, three hundred ninety-nine billion, eight hundred ninety-eight million, three hundred ninety-eight thousand, six hundred eighty-seven".