6660400202 has 4 divisors (see below), whose sum is σ = 9990600306. Its totient is φ = 3330200100.

The previous prime is 6660400183. The next prime is 6660400223. The reversal of 6660400202 is 2020040666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6523954441 + 136445761 = 80771^2 + 11681^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665100049 + ... + 1665100052.

Almost surely, 2^6660400202 is an apocalyptic number.

6660400202 is a deficient number, since it is larger than the sum of its proper divisors (3330200104).

6660400202 is a wasteful number, since it uses less digits than its factorization.

6660400202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330200103.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 6660400202 is about 81611.2749685973. The cubic root of 6660400202 is about 1881.4821759973.

Adding to 6660400202 its reverse (2020040666), we get a palindrome (8680440868).

The spelling of 6660400202 in words is "six billion, six hundred sixty million, four hundred thousand, two hundred two".