668216142 has 40 divisors (see below), whose sum is σ = 1633421592. Its totient is φ = 202489200.

The previous prime is 668216141. The next prime is 668216167. The reversal of 668216142 is 241612866.

It is a junction number, because it is equal to n+sod(n) for n = 668216097 and 668216106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668216141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185709 + ... + 189272.

Almost surely, 2^668216142 is an apocalyptic number.

668216142 is an abundant number, since it is smaller than the sum of its proper divisors (965205450).

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

668216142 is a wasteful number, since it uses less digits than its factorization.

668216142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375006 (or 374997 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 668216142 is about 25849.8770209841. The cubic root of 668216142 is about 874.2567367641.

The spelling of 668216142 in words is "six hundred sixty-eight million, two hundred sixteen thousand, one hundred forty-two".