66640372434000 has 640 divisors, whose sum is σ = 240803719004160. Its totient is φ = 17615937024000.

The previous prime is 66640372433983. The next prime is 66640372434037. The reversal of 66640372434000 is 43427304666.

66640372434000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9827510610 + ... + 9827517390.

It is an arithmetic number, because the mean of its divisors is an integer number (376255810944).

Almost surely, 2^{66640372434000} is an apocalyptic number.

66640372434000 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 66640372434000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120401859502080).

66640372434000 is an abundant number, since it is smaller than the sum of its proper divisors (174163346570160).

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

66640372434000 is a wasteful number, since it uses less digits than its factorization.

66640372434000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8373 (or 8351 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 45.

Adding to 66640372434000 its reverse (43427304666), we get a palindrome (66683799738666).

The spelling of 66640372434000 in words is "sixty-six trillion, six hundred forty billion, three hundred seventy-two million, four hundred thirty-four thousand".