378217839816 has 48 divisors (see below), whose sum is σ = 1041132453660. Its totient is φ = 124005847680.

The previous prime is 378217839781. The next prime is 378217839817. The reversal of 378217839816 is 618938712873.

378217839816 is a `hidden beast` number, since 3 + 78 + 2 + 178 + 398 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 377966744100 + 251095716 = 614790^2 + 15846^2 .

It is not an unprimeable number, because it can be changed into a prime (378217839817) 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 11 ways as a sum of consecutive naturals, for example, 43053195 + ... + 43061978.

Almost surely, 2^378217839816 is an apocalyptic number.

378217839816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

378217839816 is an abundant number, since it is smaller than the sum of its proper divisors (662914613844).

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

378217839816 is a wasteful number, since it uses less digits than its factorization.

378217839816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86115246 (or 86115239 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 378217839816 in words is "three hundred seventy-eight billion, two hundred seventeen million, eight hundred thirty-nine thousand, eight hundred sixteen".