664757196 has 12 divisors (see below), whose sum is σ = 1551100152. Its totient is φ = 221585728.

The previous prime is 664757179. The next prime is 664757251. The reversal of 664757196 is 691757466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27698205 + ... + 27698228.

It is an arithmetic number, because the mean of its divisors is an integer number (129258346).

Almost surely, 2^664757196 is an apocalyptic number.

It is an amenable number.

664757196 is an abundant number, since it is smaller than the sum of its proper divisors (886342956).

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

664757196 is a wasteful number, since it uses less digits than its factorization.

664757196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55396440 (or 55396438 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The square root of 664757196 is about 25782.8857190191. The cubic root of 664757196 is about 872.7456290449.

The spelling of 664757196 in words is "six hundred sixty-four million, seven hundred fifty-seven thousand, one hundred ninety-six".