78055055550 has 72 divisors (see below), whose sum is σ = 214584897384. Its totient is φ = 20330614080.

The previous prime is 78055055513. The next prime is 78055055591. The reversal of 78055055550 is 5555055087.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 78055055496 and 78055055505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1997577 + ... + 2036276.

It is an arithmetic number, because the mean of its divisors is an integer number (2980345797).

Almost surely, 2^78055055550 is an apocalyptic number.

78055055550 is an abundant number, since it is smaller than the sum of its proper divisors (136529841834).

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

78055055550 is a wasteful number, since it uses less digits than its factorization.

78055055550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033914 (or 4033906 counting only the distinct ones).

The product of its (nonzero) digits is 875000, while the sum is 45.

The spelling of 78055055550 in words is "seventy-eight billion, fifty-five million, fifty-five thousand, five hundred fifty".