26818218325661 has 16 divisors (see below), whose sum is σ = 30694826198400. Its totient is φ = 22952993511168.

The previous prime is 26818218325643. The next prime is 26818218325663. The reversal of 26818218325661 is 16652381281862.

It is not a de Polignac number, because 26818218325661 - 2¹⁰ = 26818218324637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26818218325661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26818218325663) 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, 12075185 + ... + 14122553.

It is an arithmetic number, because the mean of its divisors is an integer number (1918426637400).

Almost surely, 2^{26818218325661} is an apocalyptic number.

It is an amenable number.

26818218325661 is a deficient number, since it is larger than the sum of its proper divisors (3876607872739).

26818218325661 is a wasteful number, since it uses less digits than its factorization.

26818218325661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050148.

The product of its digits is 13271040, while the sum is 59.

The spelling of 26818218325661 in words is "twenty-six trillion, eight hundred eighteen billion, two hundred eighteen million, three hundred twenty-five thousand, six hundred sixty-one".