1978566766848 has 1080 divisors, whose sum is σ = 7244436534720. Its totient is φ = 525921361920.

The previous prime is 1978566766837. The next prime is 1978566766853. The reversal of 1978566766848 is 8486676658791.

1978566766848 is a `hidden beast` number, since 1 + 9 + 7 + 8 + 566 + 7 + 6 + 6 + 8 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3196391883 + ... + 3196392501.

Almost surely, 2^{1978566766848} is an apocalyptic number.

1978566766848 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978566766848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3622218267360).

1978566766848 is an abundant number, since it is smaller than the sum of its proper divisors (5265869767872).

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

1978566766848 is an equidigital number, since it uses as much as digits as its factorization.

1978566766848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 711 counting only the distinct ones).

The product of its digits is 5852528640, while the sum is 81.

The spelling of 1978566766848 in words is "one trillion, nine hundred seventy-eight billion, five hundred sixty-six million, seven hundred sixty-six thousand, eight hundred forty-eight".