19684618380 has 384 divisors, whose sum is σ = 71414784000. Its totient is φ = 4463859456.

The previous prime is 19684618357. The next prime is 19684618397. The reversal of 19684618380 is 8381648691.

19684618380 is a `hidden beast` number, since 19 + 6 + 8 + 4 + 618 + 3 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 73176886 + ... + 73177154.

It is an arithmetic number, because the mean of its divisors is an integer number (185976000).

Almost surely, 2^19684618380 is an apocalyptic number.

19684618380 is a gapful number since it is divisible by the number (10) 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 19684618380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35707392000).

19684618380 is an abundant number, since it is smaller than the sum of its proper divisors (51730165620).

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

19684618380 is a wasteful number, since it uses less digits than its factorization.

19684618380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 19684618380 in words is "nineteen billion, six hundred eighty-four million, six hundred eighteen thousand, three hundred eighty".