668963242 has 16 divisors (see below), whose sum is σ = 1053545760. Its totient is φ = 318125808.

The previous prime is 668963237. The next prime is 668963261. The reversal of 668963242 is 242369866.

It is a junction number, because it is equal to n+sod(n) for n = 668963192 and 668963201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82188 + ... + 89959.

It is an arithmetic number, because the mean of its divisors is an integer number (65846610).

Almost surely, 2^668963242 is an apocalyptic number.

668963242 is a deficient number, since it is larger than the sum of its proper divisors (384582518).

668963242 is a wasteful number, since it uses less digits than its factorization.

668963242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172245.

The product of its digits is 746496, while the sum is 46.

The square root of 668963242 is about 25864.3237298020. The cubic root of 668963242 is about 874.5824367370.

The spelling of 668963242 in words is "six hundred sixty-eight million, nine hundred sixty-three thousand, two hundred forty-two".