667722243268 has 6 divisors (see below), whose sum is σ = 1168513925726. Its totient is φ = 333861121632.

The previous prime is 667722243241. The next prime is 667722243301. The reversal of 667722243268 is 862342227766.

It can be written as a sum of positive squares in only one way, i.e., 516239376004 + 151482867264 = 718498^2 + 389208^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83465280405 + ... + 83465280412.

Almost surely, 2^667722243268 is an apocalyptic number.

It is an amenable number.

667722243268 is a deficient number, since it is larger than the sum of its proper divisors (500791682458).

667722243268 is a wasteful number, since it uses less digits than its factorization.

667722243268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166930560821 (or 166930560819 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 55.

The spelling of 667722243268 in words is "six hundred sixty-seven billion, seven hundred twenty-two million, two hundred forty-three thousand, two hundred sixty-eight".