66733569378840 has 768 divisors, whose sum is σ = 252778637260800. Its totient is φ = 13969460219904.

The previous prime is 66733569378739. The next prime is 66733569378859. The reversal of 66733569378840 is 4887396533766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5060550727 + ... + 5060563913.

It is an arithmetic number, because the mean of its divisors is an integer number (329138850600).

Almost surely, 2^{66733569378840} is an apocalyptic number.

66733569378840 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 66733569378840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126389318630400).

66733569378840 is an abundant number, since it is smaller than the sum of its proper divisors (186045067881960).

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

66733569378840 is a wasteful number, since it uses less digits than its factorization.

66733569378840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13744 (or 13733 counting only the distinct ones).

The product of its (nonzero) digits is 3292047360, while the sum is 75.

The spelling of 66733569378840 in words is "sixty-six trillion, seven hundred thirty-three billion, five hundred sixty-nine million, three hundred seventy-eight thousand, eight hundred forty".