19537666560 has 840 divisors, whose sum is σ = 76681972620. Its totient is φ = 4765630464.

The previous prime is 19537666537. The next prime is 19537666567. The reversal of 19537666560 is 6566673591.

It can be written as a sum of positive squares in 2 ways, for example, as 19470295296 + 67371264 = 139536^2 + 8208^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 19537666497 and 19537666506.

It is not an unprimeable number, because it can be changed into a prime (19537666567) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 673712626 + ... + 673712654.

Almost surely, 2^19537666560 is an apocalyptic number.

19537666560 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 19537666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38340986310).

19537666560 is an abundant number, since it is smaller than the sum of its proper divisors (57144306060).

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

19537666560 is an frugal number, since it uses more digits than its factorization.

19537666560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 6123600, while the sum is 54.

The spelling of 19537666560 in words is "nineteen billion, five hundred thirty-seven million, six hundred sixty-six thousand, five hundred sixty".