66607470666 has 128 divisors (see below), whose sum is σ = 166877798400. Its totient is φ = 19509984000.

The previous prime is 66607470641. The next prime is 66607470673.

66607470666 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 21561250 + ... + 21564338.

It is an arithmetic number, because the mean of its divisors is an integer number (1303732800).

Almost surely, 2^66607470666 is an apocalyptic number.

66607470666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66607470666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83438899200).

66607470666 is an abundant number, since it is smaller than the sum of its proper divisors (100270327734).

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

66607470666 is a wasteful number, since it uses less digits than its factorization.

66607470666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313 (or 4307 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 66607470666 in words is "sixty-six billion, six hundred seven million, four hundred seventy thousand, six hundred sixty-six".