26597855809649 has 16 divisors (see below), whose sum is σ = 28215524448000. Its totient is φ = 25018808717760.

The previous prime is 26597855809601. The next prime is 26597855809667. The reversal of 26597855809649 is 94690855879562.

It is a cyclic number.

It is not a de Polignac number, because 26597855809649 - 2⁴⁴ = 9005669765233 is a prime.

It is a super-2 number, since 2×26597855809649² (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 (26597855809699) 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, 4238852 + ... + 8435850.

It is an arithmetic number, because the mean of its divisors is an integer number (1763470278000).

Almost surely, 2^{26597855809649} is an apocalyptic number.

It is an amenable number.

26597855809649 is a deficient number, since it is larger than the sum of its proper divisors (1617668638351).

26597855809649 is a wasteful number, since it uses less digits than its factorization.

26597855809649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201600.

The product of its (nonzero) digits is 11757312000, while the sum is 83.

The spelling of 26597855809649 in words is "twenty-six trillion, five hundred ninety-seven billion, eight hundred fifty-five million, eight hundred nine thousand, six hundred forty-nine".