1980668249 has 16 divisors (see below), whose sum is σ = 2445696000. Its totient is φ = 1597845312.

The previous prime is 1980668237. The next prime is 1980668273. The reversal of 1980668249 is 9428660891.

It is a happy number.

It is not a de Polignac number, because 1980668249 - 2⁴ = 1980668233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1980668249.

It is not an unprimeable number, because it can be changed into a prime (1980668449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164009 + ... + 175670.

It is an arithmetic number, because the mean of its divisors is an integer number (152856000).

Almost surely, 2^1980668249 is an apocalyptic number.

It is an amenable number.

1980668249 is a deficient number, since it is larger than the sum of its proper divisors (465027751).

1980668249 is an equidigital number, since it uses as much as digits as its factorization.

1980668249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339717 (or 339703 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 1980668249 is about 44504.6991788508. The cubic root of 1980668249 is about 1255.8484866070.

The spelling of 1980668249 in words is "one billion, nine hundred eighty million, six hundred sixty-eight thousand, two hundred forty-nine".