668198697 has 16 divisors (see below), whose sum is σ = 906578880. Its totient is φ = 437659200.

The previous prime is 668198693. The next prime is 668198717. The reversal of 668198697 is 796891866.

It is not a de Polignac number, because 668198697 - 2² = 668198693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668198697.

It is not an unprimeable number, because it can be changed into a prime (668198693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223422 + ... + 226392.

It is an arithmetic number, because the mean of its divisors is an integer number (56661180).

Almost surely, 2^668198697 is an apocalyptic number.

It is an amenable number.

668198697 is a deficient number, since it is larger than the sum of its proper divisors (238380183).

668198697 is a wasteful number, since it uses less digits than its factorization.

668198697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264.

The product of its digits is 7838208, while the sum is 60.

The square root of 668198697 is about 25849.5395897103. The cubic root of 668198697 is about 874.2491286761.

The spelling of 668198697 in words is "six hundred sixty-eight million, one hundred ninety-eight thousand, six hundred ninety-seven".