664965786 has 8 divisors (see below), whose sum is σ = 1329931584. Its totient is φ = 221655260.

The previous prime is 664965767. The next prime is 664965793. The reversal of 664965786 is 687569466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

664965786 is an admirable number.

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, 55413810 + ... + 55413821.

It is an arithmetic number, because the mean of its divisors is an integer number (166241448).

Almost surely, 2^664965786 is an apocalyptic number.

664965786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664965786 is a wasteful number, since it uses less digits than its factorization.

664965786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110827636.

The product of its digits is 13063680, while the sum is 57.

The square root of 664965786 is about 25786.9305269161. The cubic root of 664965786 is about 872.8369039616.

The spelling of 664965786 in words is "six hundred sixty-four million, nine hundred sixty-five thousand, seven hundred eighty-six".