66147750000 has 210 divisors, whose sum is σ = 231407194200. Its totient is φ = 17638800000.

The previous prime is 66147749963. The next prime is 66147750001. The reversal of 66147750000 is 5774166.

66147750000 is a `hidden beast` number, since 6 + 6 + 147 + 7 + 500 + 0 + 0 = 666.

66147750000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×66147750000³ (a number of 33 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66147750001) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 2235301 + ... + 2264699.

It is an arithmetic number, because the mean of its divisors is an integer number (1101939020).

Almost surely, 2^66147750000 is an apocalyptic number.

66147750000 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 66147750000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115703597100).

66147750000 is an abundant number, since it is smaller than the sum of its proper divisors (165259444200).

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

66147750000 is an equidigital number, since it uses as much as digits as its factorization.

66147750000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29443 (or 29409 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 66147750000 in words is "sixty-six billion, one hundred forty-seven million, seven hundred fifty thousand".