19550437680 has 160 divisors (see below), whose sum is σ = 62638848000. Its totient is φ = 5039032320.

The previous prime is 19550437637. The next prime is 19550437681. The reversal of 19550437680 is 8673405591.

It is a super-2 number, since 2×19550437680² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (19550437681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11151684 + ... + 11153436.

It is an arithmetic number, because the mean of its divisors is an integer number (391492800).

Almost surely, 2^19550437680 is an apocalyptic number.

19550437680 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 19550437680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31319424000).

19550437680 is an abundant number, since it is smaller than the sum of its proper divisors (43088410320).

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

19550437680 is a wasteful number, since it uses less digits than its factorization.

19550437680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299 (or 3293 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 19550437680 in words is "nineteen billion, five hundred fifty million, four hundred thirty-seven thousand, six hundred eighty".