668398049 has 8 divisors (see below), whose sum is σ = 731329248. Its totient is φ = 605828160.

The previous prime is 668398043. The next prime is 668398069. The reversal of 668398049 is 940893866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668398049 - 2⁴ = 668398033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668398043) 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, 86447 + ... + 93860.

It is an arithmetic number, because the mean of its divisors is an integer number (91416156).

Almost surely, 2^668398049 is an apocalyptic number.

It is an amenable number.

668398049 is a deficient number, since it is larger than the sum of its proper divisors (62931199).

668398049 is a wasteful number, since it uses less digits than its factorization.

668398049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180655.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The square root of 668398049 is about 25853.3953089338. The cubic root of 668398049 is about 874.3360618912.

The spelling of 668398049 in words is "six hundred sixty-eight million, three hundred ninety-eight thousand, forty-nine".