666356196 has 72 divisors (see below), whose sum is σ = 1725403680. Its totient is φ = 199992320.

The previous prime is 666356189. The next prime is 666356233. The reversal of 666356196 is 691653666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153220 + ... + 157508.

It is an arithmetic number, because the mean of its divisors is an integer number (23963940).

Almost surely, 2^666356196 is an apocalyptic number.

666356196 is a gapful number since it is divisible by the number (66) 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 666356196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862701840).

666356196 is an abundant number, since it is smaller than the sum of its proper divisors (1059047484).

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

666356196 is a wasteful number, since it uses less digits than its factorization.

666356196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4425 (or 4412 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 48.

The square root of 666356196 is about 25813.8760359617. The cubic root of 666356196 is about 873.4448331247. Note that the first 3 decimals are identical.

The spelling of 666356196 in words is "six hundred sixty-six million, three hundred fifty-six thousand, one hundred ninety-six".