26780620218 has 16 divisors (see below), whose sum is σ = 58430444256. Its totient is φ = 8115339440.

The previous prime is 26780620199. The next prime is 26780620249. The reversal of 26780620218 is 81202608762.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26780620218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202883421 + ... + 202883552.

It is an arithmetic number, because the mean of its divisors is an integer number (3651902766).

Almost surely, 2^26780620218 is an apocalyptic number.

26780620218 is an abundant number, since it is smaller than the sum of its proper divisors (31649824038).

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

26780620218 is a wasteful number, since it uses less digits than its factorization.

26780620218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405766989.

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 26780620218 in words is "twenty-six billion, seven hundred eighty million, six hundred twenty thousand, two hundred eighteen".