664584198 has 16 divisors (see below), whose sum is σ = 1329431616. Its totient is φ = 221484200.

The previous prime is 664584197. The next prime is 664584199. The reversal of 664584198 is 891485466.

It is an interprime number because it is at equal distance from previous prime (664584197) and next prime (664584199).

It is a self number, because there is not a number n which added to its sum of digits gives 664584198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664584197) 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, 40273 + ... + 54323.

It is an arithmetic number, because the mean of its divisors is an integer number (83089476).

Almost surely, 2^664584198 is an apocalyptic number.

664584198 is an abundant number, since it is smaller than the sum of its proper divisors (664847418).

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

664584198 is a wasteful number, since it uses less digits than its factorization.

664584198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21939.

The product of its digits is 1658880, while the sum is 51.

The square root of 664584198 is about 25779.5306008469. The cubic root of 664584198 is about 872.6699140076.

The spelling of 664584198 in words is "six hundred sixty-four million, five hundred eighty-four thousand, one hundred ninety-eight".