1985297980371 has 4 divisors (see below), whose sum is σ = 2647063973832. Its totient is φ = 1323531986912.

The previous prime is 1985297980361. The next prime is 1985297980399. The reversal of 1985297980371 is 1730897925891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1985297980371 - 2¹⁰ = 1985297979347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1985297980296 and 1985297980305.

It is not an unprimeable number, because it can be changed into a prime (1985297980361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330882996726 + ... + 330882996731.

It is an arithmetic number, because the mean of its divisors is an integer number (661765993458).

Almost surely, 2^{1985297980371} is an apocalyptic number.

1985297980371 is a deficient number, since it is larger than the sum of its proper divisors (661765993461).

1985297980371 is an equidigital number, since it uses as much as digits as its factorization.

1985297980371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661765993460.

The product of its (nonzero) digits is 68584320, while the sum is 69.

The spelling of 1985297980371 in words is "one trillion, nine hundred eighty-five billion, two hundred ninety-seven million, nine hundred eighty thousand, three hundred seventy-one".