26699788973681 has 16 divisors (see below), whose sum is σ = 27257329673280. Its totient is φ = 26144246306880.

The previous prime is 26699788973639. The next prime is 26699788973719. The reversal of 26699788973681 is 18637988799662.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26699788973681 is a prime.

It is a super-2 number, since 2×26699788973681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26699788973621) 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, 846494771 + ... + 846526311.

It is an arithmetic number, because the mean of its divisors is an integer number (1703583104580).

Almost surely, 2^{26699788973681} is an apocalyptic number.

It is an amenable number.

26699788973681 is a deficient number, since it is larger than the sum of its proper divisors (557540699599).

26699788973681 is a wasteful number, since it uses less digits than its factorization.

26699788973681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62656.

The product of its digits is 23702740992, while the sum is 89.

The spelling of 26699788973681 in words is "twenty-six trillion, six hundred ninety-nine billion, seven hundred eighty-eight million, nine hundred seventy-three thousand, six hundred eighty-one".