66145230443520 has 704 divisors, whose sum is σ = 248355953049600. Its totient is φ = 16648532951040.

The previous prime is 66145230443393. The next prime is 66145230443543. The reversal of 66145230443520 is 2534403254166.

66145230443520 is a `hidden beast` number, since 6 + 6 + 1 + 4 + 52 + 30 + 4 + 43 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 711751297 + ... + 711844223.

It is an arithmetic number, because the mean of its divisors is an integer number (352778342400).

Almost surely, 2^{66145230443520} is an apocalyptic number.

66145230443520 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 66145230443520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124177976524800).

66145230443520 is an abundant number, since it is smaller than the sum of its proper divisors (182210722606080).

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

66145230443520 is a wasteful number, since it uses less digits than its factorization.

66145230443520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93251 (or 93227 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 45.

Adding to 66145230443520 its reverse (2534403254166), we get a palindrome (68679633697686).

The spelling of 66145230443520 in words is "sixty-six trillion, one hundred forty-five billion, two hundred thirty million, four hundred forty-three thousand, five hundred twenty".