666746407936 has 88 divisors (see below), whose sum is σ = 1523582362016. Its totient is φ = 285685678080.

The previous prime is 666746407927. The next prime is 666746407949. The reversal of 666746407936 is 639704647666.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49029490 + ... + 49043086.

It is an arithmetic number, because the mean of its divisors is an integer number (17313435932).

Almost surely, 2^666746407936 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 666746407936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (761791181008).

666746407936 is an abundant number, since it is smaller than the sum of its proper divisors (856835954080).

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

666746407936 is a wasteful number, since it uses less digits than its factorization.

666746407936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20465 (or 20447 counting only the distinct ones).

The product of its (nonzero) digits is 164602368, while the sum is 64.

The spelling of 666746407936 in words is "six hundred sixty-six billion, seven hundred forty-six million, four hundred seven thousand, nine hundred thirty-six".