66771215001660 has 192 divisors, whose sum is σ = 210128090941440. Its totient is φ = 15718895385600.

The previous prime is 66771215001641. The next prime is 66771215001713. The reversal of 66771215001660 is 6610051217766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114327385 + ... + 114909935.

It is an arithmetic number, because the mean of its divisors is an integer number (1094417140320).

Almost surely, 2^{66771215001660} is an apocalyptic number.

66771215001660 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 66771215001660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105064045470720).

66771215001660 is an abundant number, since it is smaller than the sum of its proper divisors (143356875939780).

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

66771215001660 is a wasteful number, since it uses less digits than its factorization.

66771215001660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588988 (or 588986 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 66771215001660 in words is "sixty-six trillion, seven hundred seventy-one billion, two hundred fifteen million, one thousand, six hundred sixty".