666166110064 has 320 divisors, whose sum is σ = 1692229190400. Its totient is φ = 252200632320.

The previous prime is 666166110061. The next prime is 666166110079. The reversal of 666166110064 is 460011661666.

It is a self number, because there is not a number n which added to its sum of digits gives 666166110064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666166110061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 155028364 + ... + 155032660.

It is an arithmetic number, because the mean of its divisors is an integer number (5288216220).

Almost surely, 2^666166110064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666166110064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846114595200).

666166110064 is an abundant number, since it is smaller than the sum of its proper divisors (1026063080336).

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

666166110064 is a wasteful number, since it uses less digits than its factorization.

666166110064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4433 (or 4413 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 666166110064 in words is "six hundred sixty-six billion, one hundred sixty-six million, one hundred ten thousand, sixty-four".