54778216989 has 12 divisors (see below), whose sum is σ = 74775680736. Its totient is φ = 35669533032.

The previous prime is 54778216981. The next prime is 54778217017. The reversal of 54778216989 is 98961287745.

It is not a de Polignac number, because 54778216989 - 2³ = 54778216981 is a prime.

It is a super-2 number, since 2×54778216989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54778216981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4932097 + ... + 4943190.

It is an arithmetic number, because the mean of its divisors is an integer number (6231306728).

Almost surely, 2^54778216989 is an apocalyptic number.

It is an amenable number.

54778216989 is a deficient number, since it is larger than the sum of its proper divisors (19997463747).

54778216989 is an equidigital number, since it uses as much as digits as its factorization.

54778216989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9875376 (or 9875333 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 66.

The spelling of 54778216989 in words is "fifty-four billion, seven hundred seventy-eight million, two hundred sixteen thousand, nine hundred eighty-nine".