66660019200 has 1320 divisors, whose sum is σ = 274207342464. Its totient is φ = 15925248000.

The previous prime is 66660019157. The next prime is 66660019201. The reversal of 66660019200 is 291006666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66660019201) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1092787170 + ... + 1092787230.

Almost surely, 2^66660019200 is an apocalyptic number.

66660019200 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 66660019200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137103671232).

66660019200 is an abundant number, since it is smaller than the sum of its proper divisors (207547323264).

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

66660019200 is a wasteful number, since it uses less digits than its factorization.

66660019200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 66660019200 in words is "sixty-six billion, six hundred sixty million, nineteen thousand, two hundred".