664661214 has 40 divisors (see below), whose sum is σ = 1702098288. Its totient is φ = 189902880.

The previous prime is 664661213. The next prime is 664661219. The reversal of 664661214 is 412166466.

664661214 is a `hidden beast` number, since 6 + 646 + 6 + 1 + 2 + 1 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664661213) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 291927 + ... + 294194.

Almost surely, 2^664661214 is an apocalyptic number.

664661214 is an abundant number, since it is smaller than the sum of its proper divisors (1037437074).

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

664661214 is a wasteful number, since it uses less digits than its factorization.

664661214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586142 (or 586133 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 664661214 is about 25781.0243008303. The cubic root of 664661214 is about 872.7036227789.

The spelling of 664661214 in words is "six hundred sixty-four million, six hundred sixty-one thousand, two hundred fourteen".