378661633616 has 40 divisors (see below), whose sum is σ = 882594790080. Its totient is φ = 153742316544.

The previous prime is 378661633607. The next prime is 378661633627. The reversal of 378661633616 is 616336166873.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88969121 + ... + 88973376.

It is an arithmetic number, because the mean of its divisors is an integer number (22064869752).

Almost surely, 2^378661633616 is an apocalyptic number.

It is an amenable number.

378661633616 is an abundant number, since it is smaller than the sum of its proper divisors (503933156464).

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

378661633616 is a wasteful number, since it uses less digits than its factorization.

378661633616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177942531 (or 177942525 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 56.

The spelling of 378661633616 in words is "three hundred seventy-eight billion, six hundred sixty-one million, six hundred thirty-three thousand, six hundred sixteen".