5561116722778 has 4 divisors (see below), whose sum is σ = 8341675084170. Its totient is φ = 2780558361388.

The previous prime is 5561116722761. The next prime is 5561116722781. The reversal of 5561116722778 is 8772276111655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5306559138409 + 254557584369 = 2303597^2 + 504537^2 .

It is a super-2 number, since 2×5561116722778² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390279180693 + ... + 1390279180696.

Almost surely, 2^{5561116722778} is an apocalyptic number.

5561116722778 is a deficient number, since it is larger than the sum of its proper divisors (2780558361392).

5561116722778 is a wasteful number, since it uses less digits than its factorization.

5561116722778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780558361391.

The product of its digits is 9878400, while the sum is 58.

The spelling of 5561116722778 in words is "five trillion, five hundred sixty-one billion, one hundred sixteen million, seven hundred twenty-two thousand, seven hundred seventy-eight".