1778866544994 has 256 divisors, whose sum is σ = 4616269332480. Its totient is φ = 443483424000.

The previous prime is 1778866544971. The next prime is 1778866545007. The reversal of 1778866544994 is 4994456688771.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1712094327 + ... + 1712095365.

It is an arithmetic number, because the mean of its divisors is an integer number (18032302080).

Almost surely, 2^{1778866544994} is an apocalyptic number.

1778866544994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778866544994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308134666240).

1778866544994 is an abundant number, since it is smaller than the sum of its proper divisors (2837402787486).

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

1778866544994 is a wasteful number, since it uses less digits than its factorization.

1778866544994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957.

The product of its digits is 2926264320, while the sum is 78.

The spelling of 1778866544994 in words is "one trillion, seven hundred seventy-eight billion, eight hundred sixty-six million, five hundred forty-four thousand, nine hundred ninety-four".