1985297980328 has 16 divisors (see below), whose sum is σ = 4008774768180. Its totient is φ = 916291375488.

The previous prime is 1985297980297. The next prime is 1985297980361. The reversal of 1985297980328 is 8230897925891.

It can be written as a sum of positive squares in 2 ways, for example, as 1550777071204 + 434520909124 = 1245302^2 + 659182^2 .

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, 9544701725 + ... + 9544701932.

Almost surely, 2^{1985297980328} is an apocalyptic number.

It is an amenable number.

1985297980328 is an abundant number, since it is smaller than the sum of its proper divisors (2023476787852).

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

1985297980328 is a wasteful number, since it uses less digits than its factorization.

1985297980328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19089403676 (or 19089403672 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 71.

The spelling of 1985297980328 in words is "one trillion, nine hundred eighty-five billion, two hundred ninety-seven million, nine hundred eighty thousand, three hundred twenty-eight".