5555557777779 has 10 divisors (see below), whose sum is σ = 8299043100260. Its totient is φ = 3703705185132.

The previous prime is 5555557777753. The next prime is 5555557777793. The reversal of 5555557777779 is 9777777555555.

5555557777779 is a `hidden beast` number, since 5 + 5 + 55 + 557 + 7 + 7 + 7 + 7 + 7 + 9 = 666.

It is not a de Polignac number, because 5555557777779 - 2¹¹ = 5555557775731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81), and also a Moran number because the ratio is a prime number: 68587133059 = 5555557777779 / (5 + 5 + 5 + 5 + 5 + 5 + 7 + 7 + 7 + 7 + 7 + 7 + 9).

It is a Duffinian number.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 5555557777698 and 5555557777707.

It is not an unprimeable number, because it can be changed into a prime (5555557777799) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 34293566449 + ... + 34293566610.

It is an arithmetic number, because the mean of its divisors is an integer number (829904310026).

Almost surely, 2^{5555557777779} is an apocalyptic number.

5555557777779 is a deficient number, since it is larger than the sum of its proper divisors (2743485322481).

5555557777779 is an equidigital number, since it uses as much as digits as its factorization.

5555557777779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68587133071 (or 68587133062 counting only the distinct ones).

The product of its digits is 16544390625, while the sum is 81.

It can be divided in two parts, 5555557 and 777779, that added together give a palindrome (6333336).

The spelling of 5555557777779 in words is "five trillion, five hundred fifty-five billion, five hundred fifty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-nine".