66402202 has 4 divisors (see below), whose sum is σ = 99603306. Its totient is φ = 33201100.

The previous prime is 66402179. The next prime is 66402209. The reversal of 66402202 is 20220466.

It is a happy number.

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., 42889401 + 23512801 = 6549^2 + 4849^2 .

It is not an unprimeable number, because it can be changed into a prime (66402209) by changing a digit.

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, 16600549 + ... + 16600552.

Almost surely, 2^66402202 is an apocalyptic number.

66402202 is a deficient number, since it is larger than the sum of its proper divisors (33201104).

66402202 is a wasteful number, since it uses less digits than its factorization.

66402202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33201103.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 66402202 is about 8148.7546287761. The cubic root of 66402202 is about 404.9432466326.

Adding to 66402202 its reverse (20220466), we get a palindrome (86622668).

The spelling of 66402202 in words is "sixty-six million, four hundred two thousand, two hundred two".