19986507216 has 160 divisors (see below), whose sum is σ = 63912576000. Its totient is φ = 5937587712.

The previous prime is 19986507197. The next prime is 19986507223. The reversal of 19986507216 is 61270568991.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 31 ways as a sum of consecutive naturals, for example, 101505 + ... + 224223.

It is an arithmetic number, because the mean of its divisors is an integer number (399453600).

Almost surely, 2^19986507216 is an apocalyptic number.

19986507216 is a gapful number since it is divisible by the number (16) 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 19986507216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31956288000).

19986507216 is an abundant number, since it is smaller than the sum of its proper divisors (43926068784).

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

19986507216 is a wasteful number, since it uses less digits than its factorization.

19986507216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122778 (or 122766 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 19986507216 in words is "nineteen billion, nine hundred eighty-six million, five hundred seven thousand, two hundred sixteen".