668968002 has 24 divisors (see below), whose sum is σ = 1450704060. Its totient is φ = 222793440.

The previous prime is 668967977. The next prime is 668968007. The reversal of 668968002 is 200869866.

It can be written as a sum of positive squares in 2 ways, for example, as 633075921 + 35892081 = 25161^2 + 5991^2 .

It is not an unprimeable number, because it can be changed into a prime (668968007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5524 + ... + 36992.

Almost surely, 2^668968002 is an apocalyptic number.

668968002 is an abundant number, since it is smaller than the sum of its proper divisors (781736058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668968002 is a wasteful number, since it uses less digits than its factorization.

668968002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32658 (or 32655 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 668968002 is about 25864.4157482824. The cubic root of 668968002 is about 874.5845110924.

It can be divided in two parts, 6689 and 68002, that added together give a triangular number (74691 = T₃₈₆).

The spelling of 668968002 in words is "six hundred sixty-eight million, nine hundred sixty-eight thousand, two".