5555557877778 has 24 divisors (see below), whose sum is σ = 12560391724608. Its totient is φ = 1771337294232.

The previous prime is 5555557877777. The next prime is 5555557877789. The reversal of 5555557877778 is 8777787555555.

5555557877778 is a `hidden beast` number, since 5 + 5 + 55 + 557 + 8 + 7 + 7 + 7 + 7 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5555557877697 and 5555557877706.

It is not an unprimeable number, because it can be changed into a prime (5555557877777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6709610550 + ... + 6709611377.

It is an arithmetic number, because the mean of its divisors is an integer number (523349655192).

Almost surely, 2^{5555557877778} is an apocalyptic number.

5555557877778 is an abundant number, since it is smaller than the sum of its proper divisors (7004833846830).

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

5555557877778 is a wasteful number, since it uses less digits than its factorization.

5555557877778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13419221958 (or 13419221955 counting only the distinct ones).

The product of its digits is 16807000000, while the sum is 81.

The spelling of 5555557877778 in words is "five trillion, five hundred fifty-five billion, five hundred fifty-seven million, eight hundred seventy-seven thousand, seven hundred seventy-eight".