It is an unprimeable number.
Almost surely, 2122736511052778 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
122736511052778 is a wasteful number, since it uses less digits than its factorization.
122736511052778 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 230860122.
Adding to 122736511052778 its reverse (877250115637221), we get a palindrome (999986626689999).
The spelling of 122736511052778 in words is "one hundred twenty-two trillion, seven hundred thirty-six billion, five hundred eleven million, fifty-two thousand, seven hundred seventy-eight".