19979556016 has 40 divisors (see below), whose sum is σ = 44669990144. Its totient is φ = 8479529280.

The previous prime is 19979555993. The next prime is 19979556019. The reversal of 19979556016 is 61065597991.

It is not an unprimeable number, because it can be changed into a prime (19979556019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854430 + ... + 877501.

Almost surely, 2^19979556016 is an apocalyptic number.

19979556016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19979556016 is an abundant number, since it is smaller than the sum of its proper divisors (24690434128).

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

19979556016 is a wasteful number, since it uses less digits than its factorization.

19979556016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732049 (or 1732043 counting only the distinct ones).

The product of its (nonzero) digits is 4592700, while the sum is 58.

The spelling of 19979556016 in words is "nineteen billion, nine hundred seventy-nine million, five hundred fifty-six thousand, sixteen".