666496951596 has 108 divisors (see below), whose sum is σ = 1965160430688. Its totient is φ = 189908639424.

The previous prime is 666496951573. The next prime is 666496951669. The reversal of 666496951596 is 695159694666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 132630 + ... + 1162146.

Almost surely, 2^666496951596 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 666496951596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982580215344).

666496951596 is an abundant number, since it is smaller than the sum of its proper divisors (1298663479092).

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

666496951596 is a wasteful number, since it uses less digits than its factorization.

666496951596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029908 (or 1029896 counting only the distinct ones).

The product of its digits is 566870400, while the sum is 72.

The spelling of 666496951596 in words is "six hundred sixty-six billion, four hundred ninety-six million, nine hundred fifty-one thousand, five hundred ninety-six".