19677779712 has 360 divisors, whose sum is σ = 62192093040. Its totient is φ = 6177669120.

The previous prime is 19677779711. The next prime is 19677779747. The reversal of 19677779712 is 21797777691.

It is a self number, because there is not a number n which added to its sum of digits gives 19677779712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19677779711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25857412 + ... + 25858172.

It is an arithmetic number, because the mean of its divisors is an integer number (172755814).

Almost surely, 2^19677779712 is an apocalyptic number.

19677779712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19677779712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31096046520).

19677779712 is an abundant number, since it is smaller than the sum of its proper divisors (42514313328).

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

19677779712 is an equidigital number, since it uses as much as digits as its factorization.

19677779712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 838 counting only the distinct ones).

The product of its digits is 16336404, while the sum is 63.

The spelling of 19677779712 in words is "nineteen billion, six hundred seventy-seven million, seven hundred seventy-nine thousand, seven hundred twelve".