55478147992 has 16 divisors (see below), whose sum is σ = 104560502040. Its totient is φ = 27595347456.

The previous prime is 55478147981. The next prime is 55478147999. The reversal of 55478147992 is 29974187455.

55478147992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55478147992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55478147999) 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, 17964178 + ... + 17967265.

Almost surely, 2^55478147992 is an apocalyptic number.

It is an amenable number.

55478147992 is a deficient number, since it is larger than the sum of its proper divisors (49082354048).

55478147992 is a wasteful number, since it uses less digits than its factorization.

55478147992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35931642 (or 35931638 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 61.

The spelling of 55478147992 in words is "fifty-five billion, four hundred seventy-eight million, one hundred forty-seven thousand, nine hundred ninety-two".