668818142 has 16 divisors (see below), whose sum is σ = 1038221712. Its totient is φ = 322882560.

The previous prime is 668818141. The next prime is 668818151. The reversal of 668818142 is 241818866.

It is a junction number, because it is equal to n+sod(n) for n = 668818093 and 668818102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668818141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24803 + ... + 44190.

It is an arithmetic number, because the mean of its divisors is an integer number (64888857).

Almost surely, 2^668818142 is an apocalyptic number.

668818142 is a deficient number, since it is larger than the sum of its proper divisors (369403570).

668818142 is a wasteful number, since it uses less digits than its factorization.

668818142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69163.

The product of its digits is 147456, while the sum is 44.

The square root of 668818142 is about 25861.5185555682. The cubic root of 668818142 is about 874.5191990383.

The spelling of 668818142 in words is "six hundred sixty-eight million, eight hundred eighteen thousand, one hundred forty-two".