66197768335776 has 576 divisors, whose sum is σ = 247353909304320. Its totient is φ = 16269483847680.

The previous prime is 66197768335711. The next prime is 66197768335793. The reversal of 66197768335776 is 67753386779166.

66197768335776 is a `hidden beast` number, since 6 + 6 + 1 + 9 + 7 + 7 + 6 + 8 + 33 + 577 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 66197768335695 and 66197768335704.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 348356500 + ... + 348546476.

It is an arithmetic number, because the mean of its divisors is an integer number (429433870320).

Almost surely, 2^{66197768335776} is an apocalyptic number.

66197768335776 is a gapful number since it is divisible by the number (66) 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 66197768335776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123676954652160).

66197768335776 is an abundant number, since it is smaller than the sum of its proper divisors (181156140968544).

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

66197768335776 is a wasteful number, since it uses less digits than its factorization.

66197768335776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190857 (or 190846 counting only the distinct ones).

The product of its digits is 10081895040, while the sum is 81.

The spelling of 66197768335776 in words is "sixty-six trillion, one hundred ninety-seven billion, seven hundred sixty-eight million, three hundred thirty-five thousand, seven hundred seventy-six".