55499778078 has 16 divisors (see below), whose sum is σ = 111160200576. Its totient is φ = 18473151960.

The previous prime is 55499778073. The next prime is 55499778143. The reversal of 55499778078 is 87087799455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55499778071) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6689026 + ... + 6697317.

It is an arithmetic number, because the mean of its divisors is an integer number (6947512536).

Almost surely, 2^55499778078 is an apocalyptic number.

55499778078 is an abundant number, since it is smaller than the sum of its proper divisors (55660422498).

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

55499778078 is a wasteful number, since it uses less digits than its factorization.

55499778078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13387039.

The product of its (nonzero) digits is 177811200, while the sum is 69.

The spelling of 55499778078 in words is "fifty-five billion, four hundred ninety-nine million, seven hundred seventy-eight thousand, seventy-eight".