667598221 has 8 divisors (see below), whose sum is σ = 672023520. Its totient is φ = 663181008.

The previous prime is 667598219. The next prime is 667598249. The reversal of 667598221 is 122895766.

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 667598221 - 2¹ = 667598219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667598201) 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, 334990 + ... + 336976.

It is an arithmetic number, because the mean of its divisors is an integer number (84002940).

Almost surely, 2^667598221 is an apocalyptic number.

It is an amenable number.

667598221 is a deficient number, since it is larger than the sum of its proper divisors (4425299).

667598221 is a wasteful number, since it uses less digits than its factorization.

667598221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043.

The product of its digits is 362880, while the sum is 46.

The square root of 667598221 is about 25837.9221494299. The cubic root of 667598221 is about 873.9871691952.

The spelling of 667598221 in words is "six hundred sixty-seven million, five hundred ninety-eight thousand, two hundred twenty-one".