66461472000 has 2016 divisors, whose sum is σ = 317848737024. Its totient is φ = 13436928000.

The previous prime is 66461471983. The next prime is 66461472097. The reversal of 66461472000 is 27416466.

66461472000 is a `hidden beast` number, since 6 + 646 + 1 + 4 + 7 + 2 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2016).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 1796255982 + ... + 1796256018.

It is an arithmetic number, because the mean of its divisors is an integer number (157663064).

Almost surely, 2^66461472000 is an apocalyptic number.

66461472000 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 66461472000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158924368512).

66461472000 is an abundant number, since it is smaller than the sum of its proper divisors (251387265024).

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

66461472000 is an equidigital number, since it uses as much as digits as its factorization.

66461472000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

Adding to 66461472000 its reverse (27416466), we get a palindrome (66488888466).

The spelling of 66461472000 in words is "sixty-six billion, four hundred sixty-one million, four hundred seventy-two thousand".