664414197 has 4 divisors (see below), whose sum is σ = 885885600. Its totient is φ = 442942796.

The previous prime is 664414193. The next prime is 664414241. The reversal of 664414197 is 791414466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664414197 - 2² = 664414193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664414193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110735697 + ... + 110735702.

It is an arithmetic number, because the mean of its divisors is an integer number (221471400).

Almost surely, 2^664414197 is an apocalyptic number.

It is an amenable number.

664414197 is a deficient number, since it is larger than the sum of its proper divisors (221471403).

664414197 is a wasteful number, since it uses less digits than its factorization.

664414197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221471402.

The product of its digits is 145152, while the sum is 42.

The square root of 664414197 is about 25776.2331809751. The cubic root of 664414197 is about 872.5954978489.

The spelling of 664414197 in words is "six hundred sixty-four million, four hundred fourteen thousand, one hundred ninety-seven".