646663716262 has 4 divisors (see below), whose sum is σ = 969995574396. Its totient is φ = 323331858130.

The previous prime is 646663716233. The next prime is 646663716263. The reversal of 646663716262 is 262617366646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 262617366646 = 2 ⋅131308683323.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646663716263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161665929064 + ... + 161665929067.

It is an arithmetic number, because the mean of its divisors is an integer number (242498893599).

Almost surely, 2^646663716262 is an apocalyptic number.

646663716262 is a deficient number, since it is larger than the sum of its proper divisors (323331858134).

646663716262 is a wasteful number, since it uses less digits than its factorization.

646663716262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323331858133.

The product of its digits is 15676416, while the sum is 55.

The spelling of 646663716262 in words is "six hundred forty-six billion, six hundred sixty-three million, seven hundred sixteen thousand, two hundred sixty-two".