664666246 has 8 divisors (see below), whose sum is σ = 1049473080. Its totient is φ = 314841888.

The previous prime is 664666237. The next prime is 664666273. The reversal of 664666246 is 642666466.

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

It is a junction number, because it is equal to n+sod(n) for n = 664666196 and 664666205.

It is a congruent 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, 8745571 + ... + 8745646.

It is an arithmetic number, because the mean of its divisors is an integer number (131184135).

Almost surely, 2^664666246 is an apocalyptic number.

664666246 is a deficient number, since it is larger than the sum of its proper divisors (384806834).

664666246 is a wasteful number, since it uses less digits than its factorization.

664666246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17491238.

The product of its digits is 1492992, while the sum is 46.

The square root of 664666246 is about 25781.1218918029. The cubic root of 664666246 is about 872.7058251207.

The spelling of 664666246 in words is "six hundred sixty-four million, six hundred sixty-six thousand, two hundred forty-six".