66660000000 has 576 divisors, whose sum is σ = 244321249536. Its totient is φ = 16000000000.

The previous prime is 66659999983. The next prime is 66660000061. The reversal of 66660000000 is 6666.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 659999950 + ... + 660000050.

It is an arithmetic number, because the mean of its divisors is an integer number (424168836).

Almost surely, 2^66660000000 is an apocalyptic number.

66660000000 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 66660000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122160624768).

66660000000 is an abundant number, since it is smaller than the sum of its proper divisors (177661249536).

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

66660000000 is an frugal number, since it uses more digits than its factorization.

66660000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 66660000000 its reverse (6666), we get a palindrome (66660006666).

66660000000 divided by its reverse (6666) gives a 7-th power (10000000 = 10⁷).

It can be divided in two parts, 66 and 660000000, that added together give a palindrome (660000066).

The spelling of 66660000000 in words is "sixty-six billion, six hundred sixty million", and thus it is an aban number.