66642663202 has 4 divisors (see below), whose sum is σ = 99963994806. Its totient is φ = 33321331600.

The previous prime is 66642663179. The next prime is 66642663223. The reversal of 66642663202 is 20236624666.

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., 66465480481 + 177182721 = 257809^2 + 13311^2 .

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, 16660665799 + ... + 16660665802.

Almost surely, 2^66642663202 is an apocalyptic number.

66642663202 is a deficient number, since it is larger than the sum of its proper divisors (33321331604).

66642663202 is a wasteful number, since it uses less digits than its factorization.

66642663202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33321331603.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 66642663202 in words is "sixty-six billion, six hundred forty-two million, six hundred sixty-three thousand, two hundred two".