378877702566 has 128 divisors (see below), whose sum is σ = 892995840000. Its totient is φ = 105927816960.

The previous prime is 378877702519. The next prime is 378877702571. The reversal of 378877702566 is 665207778873.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 378877702497 and 378877702506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18700810 + ... + 18721058.

It is an arithmetic number, because the mean of its divisors is an integer number (6976530000).

Almost surely, 2^378877702566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 378877702566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446497920000).

378877702566 is an abundant number, since it is smaller than the sum of its proper divisors (514118137434).

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

378877702566 is a wasteful number, since it uses less digits than its factorization.

378877702566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20674.

The product of its (nonzero) digits is 165957120, while the sum is 66.

The spelling of 378877702566 in words is "three hundred seventy-eight billion, eight hundred seventy-seven million, seven hundred two thousand, five hundred sixty-six".