668219016 has 16 divisors (see below), whose sum is σ = 1670547600. Its totient is φ = 222739664.

The previous prime is 668218987. The next prime is 668219047. The reversal of 668219016 is 610912866.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13921206 + ... + 13921253.

It is an arithmetic number, because the mean of its divisors is an integer number (104409225).

Almost surely, 2^668219016 is an apocalyptic number.

It is an amenable number.

668219016 is an abundant number, since it is smaller than the sum of its proper divisors (1002328584).

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

668219016 is a wasteful number, since it uses less digits than its factorization.

668219016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27842468 (or 27842464 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 668219016 is about 25849.9326111307. The cubic root of 668219016 is about 874.2579901561.

The spelling of 668219016 in words is "six hundred sixty-eight million, two hundred nineteen thousand, sixteen".