1985478519744 has 112 divisors (see below), whose sum is σ = 5839518663840. Its totient is φ = 661533696000.

The previous prime is 1985478519679. The next prime is 1985478519763. The reversal of 1985478519744 is 4479158745891.

1985478519744 is a `hidden beast` number, since 1 + 9 + 8 + 547 + 8 + 5 + 1 + 9 + 74 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3674994 + ... + 4180494.

Almost surely, 2^{1985478519744} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985478519744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2919759331920).

1985478519744 is an abundant number, since it is smaller than the sum of its proper divisors (3854040144096).

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

1985478519744 is a wasteful number, since it uses less digits than its factorization.

1985478519744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507795 (or 507779 counting only the distinct ones).

The product of its digits is 406425600, while the sum is 72.

The spelling of 1985478519744 in words is "one trillion, nine hundred eighty-five billion, four hundred seventy-eight million, five hundred nineteen thousand, seven hundred forty-four".