1378776666894 has 128 divisors (see below), whose sum is σ = 3157248098304. Its totient is φ = 397622112000.

The previous prime is 1378776666887. The next prime is 1378776666901. The reversal of 1378776666894 is 4986666778731.

It is an interprime number because it is at equal distance from previous prime (1378776666887) and next prime (1378776666901).

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, 29969329 + ... + 30015299.

It is an arithmetic number, because the mean of its divisors is an integer number (24666000768).

Almost surely, 2^{1378776666894} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378776666894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1578624049152).

1378776666894 is an abundant number, since it is smaller than the sum of its proper divisors (1778471431410).

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

1378776666894 is a wasteful number, since it uses less digits than its factorization.

1378776666894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46262.

The product of its digits is 3072577536, while the sum is 78.

The spelling of 1378776666894 in words is "one trillion, three hundred seventy-eight billion, seven hundred seventy-six million, six hundred sixty-six thousand, eight hundred ninety-four".