55784998778 has 8 divisors (see below), whose sum is σ = 84231654240. Its totient is φ = 27707780700.

The previous prime is 55784998769. The next prime is 55784998781. The reversal of 55784998778 is 87789948755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55784998778² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55784998699 and 55784998708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92358968 + ... + 92359571.

It is an arithmetic number, because the mean of its divisors is an integer number (10528956780).

Almost surely, 2^55784998778 is an apocalyptic number.

55784998778 is a deficient number, since it is larger than the sum of its proper divisors (28446655462).

55784998778 is a wasteful number, since it uses less digits than its factorization.

55784998778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184718692.

The product of its digits is 1422489600, while the sum is 77.

The spelling of 55784998778 in words is "fifty-five billion, seven hundred eighty-four million, nine hundred ninety-eight thousand, seven hundred seventy-eight".