1978853777328 has 40 divisors (see below), whose sum is σ = 5114831090176. Its totient is φ = 659257646400.

The previous prime is 1978853777309. The next prime is 1978853777363. The reversal of 1978853777328 is 8237773588791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978853777328.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11169928 + ... + 11345703.

Almost surely, 2^{1978853777328} is an apocalyptic number.

It is an amenable number.

1978853777328 is an abundant number, since it is smaller than the sum of its proper divisors (3135977312848).

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

1978853777328 is a wasteful number, since it uses less digits than its factorization.

1978853777328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22517473 (or 22517467 counting only the distinct ones).

The product of its digits is 995742720, while the sum is 75.

The spelling of 1978853777328 in words is "one trillion, nine hundred seventy-eight billion, eight hundred fifty-three million, seven hundred seventy-seven thousand, three hundred twenty-eight".