66021208704 has 768 divisors, whose sum is σ = 233834428800. Its totient is φ = 18247680000.

The previous prime is 66021208697. The next prime is 66021208711. The reversal of 66021208704 is 40780212066.

It is an interprime number because it is at equal distance from previous prime (66021208697) and next prime (66021208711).

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 (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 263032579 + ... + 263032829.

Almost surely, 2^66021208704 is an apocalyptic number.

66021208704 is a gapful number since it is divisible by the number (64) 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 66021208704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116917214400).

66021208704 is an abundant number, since it is smaller than the sum of its proper divisors (167813220096).

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

66021208704 is a wasteful number, since it uses less digits than its factorization.

66021208704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 66021208704 in words is "sixty-six billion, twenty-one million, two hundred eight thousand, seven hundred four".