657668343202 has 24 divisors (see below), whose sum is σ = 1075393991700. Its totient is φ = 301502036160.

The previous prime is 657668343197. The next prime is 657668343221. The reversal of 657668343202 is 202343866756.

It can be written as a sum of positive squares in 6 ways, for example, as 42571656241 + 615096686961 = 206329^2 + 784281^2 .

It is a super-2 number, since 2×657668343202² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 657668343202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6479049 + ... + 6579772.

Almost surely, 2^657668343202 is an apocalyptic number.

657668343202 is a deficient number, since it is larger than the sum of its proper divisors (417725648498).

657668343202 is a wasteful number, since it uses less digits than its factorization.

657668343202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13058998 (or 13058985 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 52.

The spelling of 657668343202 in words is "six hundred fifty-seven billion, six hundred sixty-eight million, three hundred forty-three thousand, two hundred two".