1980983645 has 8 divisors (see below), whose sum is σ = 2382273504. Its totient is φ = 1581391504.

The previous prime is 1980983617. The next prime is 1980983651. The reversal of 1980983645 is 5463890891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1980983645 - 2¹⁰ = 1980982621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421859 + ... + 426528.

It is an arithmetic number, because the mean of its divisors is an integer number (297784188).

Almost surely, 2^1980983645 is an apocalyptic number.

It is an amenable number.

1980983645 is a deficient number, since it is larger than the sum of its proper divisors (401289859).

1980983645 is an equidigital number, since it uses as much as digits as its factorization.

1980983645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848859.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 1980983645 is about 44508.2424389011. The cubic root of 1980983645 is about 1255.9151423207.

The spelling of 1980983645 in words is "one billion, nine hundred eighty million, nine hundred eighty-three thousand, six hundred forty-five".