378861665644 has 48 divisors (see below), whose sum is σ = 875231239680. Its totient is φ = 138925589760.

The previous prime is 378861665629. The next prime is 378861665653. The reversal of 378861665644 is 446566168873.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36173304 + ... + 36183775.

It is an arithmetic number, because the mean of its divisors is an integer number (18233984160).

Almost surely, 2^378861665644 is an apocalyptic number.

378861665644 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

378861665644 is an abundant number, since it is smaller than the sum of its proper divisors (496369574036).

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

378861665644 is a wasteful number, since it uses less digits than its factorization.

378861665644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72357118 (or 72357116 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 64.

The spelling of 378861665644 in words is "three hundred seventy-eight billion, eight hundred sixty-one million, six hundred sixty-five thousand, six hundred forty-four".