66581871360 has 288 divisors, whose sum is σ = 216446452992. Its totient is φ = 17440849920.

The previous prime is 66581871341. The next prime is 66581871409. The reversal of 66581871360 is 6317818566.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53824662 + ... + 53825898.

It is an arithmetic number, because the mean of its divisors is an integer number (751550184).

Almost surely, 2^66581871360 is an apocalyptic number.

66581871360 is a gapful number since it is divisible by the number (60) 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 66581871360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108223226496).

66581871360 is an abundant number, since it is smaller than the sum of its proper divisors (149864581632).

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

66581871360 is a wasteful number, since it uses less digits than its factorization.

66581871360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 66581871360 in words is "sixty-six billion, five hundred eighty-one million, eight hundred seventy-one thousand, three hundred sixty".