666197802 has 96 divisors (see below), whose sum is σ = 1624568400. Its totient is φ = 196245504.

The previous prime is 666197771. The next prime is 666197803. The reversal of 666197802 is 208791666.

It can be written as a sum of positive squares in 8 ways, for example, as 664556841 + 1640961 = 25779^2 + 1281^2 .

It is a super-2 number, since 2×666197802² = 887639022779262408, which contains 22 as substring.

666197802 is a modest number, since divided by 197802 gives 666 as remainder.

It is not an unprimeable number, because it can be changed into a prime (666197803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 327324 + ... + 329352.

Almost surely, 2^666197802 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666197802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812284200).

666197802 is an abundant number, since it is smaller than the sum of its proper divisors (958370598).

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

666197802 is a wasteful number, since it uses less digits than its factorization.

666197802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 2117 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 666197802 is about 25810.8078525257. The cubic root of 666197802 is about 873.3756212001.

The spelling of 666197802 in words is "six hundred sixty-six million, one hundred ninety-seven thousand, eight hundred two".