1978493806160 has 20 divisors (see below), whose sum is σ = 4599998099508. Its totient is φ = 791397522432.

The previous prime is 1978493806147. The next prime is 1978493806171. The reversal of 1978493806160 is 616083948791.

It can be written as a sum of positive squares in 2 ways, for example, as 1551180575296 + 427313230864 = 1245464^2 + 653692^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×1978493806160³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1978493806093 and 1978493806102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12365586209 + ... + 12365586368.

Almost surely, 2^{1978493806160} is an apocalyptic number.

1978493806160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978493806160 is an abundant number, since it is smaller than the sum of its proper divisors (2621504293348).

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

1978493806160 is a wasteful number, since it uses less digits than its factorization.

1978493806160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24731172590 (or 24731172584 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 1978493806160 in words is "one trillion, nine hundred seventy-eight billion, four hundred ninety-three million, eight hundred six thousand, one hundred sixty".