1980649658 has 8 divisors (see below), whose sum is σ = 3199511028. Its totient is φ = 914145984.

The previous prime is 1980649637. The next prime is 1980649663. The reversal of 1980649658 is 8569460891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1826964049 + 153685609 = 42743^2 + 12397^2 .

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

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, 38089391 + ... + 38089442.

Almost surely, 2^1980649658 is an apocalyptic number.

1980649658 is a deficient number, since it is larger than the sum of its proper divisors (1218861370).

1980649658 is a wasteful number, since it uses less digits than its factorization.

1980649658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76178848.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The square root of 1980649658 is about 44504.4903127763. The cubic root of 1980649658 is about 1255.8445573687.

The spelling of 1980649658 in words is "one billion, nine hundred eighty million, six hundred forty-nine thousand, six hundred fifty-eight".