It is a plaindrome in base 10.
It is an unprimeable number.
Almost surely, 23555557777778 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3555557777778 is a wasteful number, since it uses less digits than its factorization.
3555557777778 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 680006.
The spelling of 3555557777778 in words is "three trillion, five hundred fifty-five billion, five hundred fifty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".