5555557777780 has 96 divisors (see below), whose sum is σ = 12485579652000. Its totient is φ = 2069167472640.

The previous prime is 5555557777753. The next prime is 5555557777793. The reversal of 5555557777780 is 877777555555.

It can be written as a sum of positive squares in 16 ways, for example, as 2197824040036 + 3357733737744 = 1482506^2 + 1832412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11643346 + ... + 12111094.

It is an arithmetic number, because the mean of its divisors is an integer number (130058121375).

Almost surely, 2^{5555557777780} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5555557777780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6242789826000).

5555557777780 is an abundant number, since it is smaller than the sum of its proper divisors (6930021874220).

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

5555557777780 is a wasteful number, since it uses less digits than its factorization.

5555557777780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468149 (or 468147 counting only the distinct ones).

The product of its (nonzero) digits is 2100875000, while the sum is 73.

It can be divided in two parts, 5 and 555557777780, that multiplied together give a square (2777788888900 = 1666670²).

The spelling of 5555557777780 in words is "five trillion, five hundred fifty-five billion, five hundred fifty-seven million, seven hundred seventy-seven thousand, seven hundred eighty".