55555777777 has 4 divisors (see below), whose sum is σ = 57971246400. Its totient is φ = 53140309156.

The previous prime is 55555777727. The next prime is 55555777883. The reversal of 55555777777 is 77777755555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55555777777 - 2⁷ = 55555777649 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55555777727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207734277 + ... + 1207734322.

It is an arithmetic number, because the mean of its divisors is an integer number (14492811600).

Almost surely, 2^55555777777 is an apocalyptic number.

It is an amenable number.

55555777777 is a deficient number, since it is larger than the sum of its proper divisors (2415468623).

55555777777 is a wasteful number, since it uses less digits than its factorization.

55555777777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415468622.

The product of its digits is 367653125, while the sum is 67.

The spelling of 55555777777 in words is "fifty-five billion, five hundred fifty-five million, seven hundred seventy-seven thousand, seven hundred seventy-seven".