664741606 has 8 divisors (see below), whose sum is σ = 1006793424. Its totient is φ = 329143800.

The previous prime is 664741589. The next prime is 664741661. The reversal of 664741606 is 606147466.

It is a happy number.

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

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, 1613245 + ... + 1613656.

It is an arithmetic number, because the mean of its divisors is an integer number (125849178).

Almost surely, 2^664741606 is an apocalyptic number.

664741606 is a deficient number, since it is larger than the sum of its proper divisors (342051818).

664741606 is a wasteful number, since it uses less digits than its factorization.

664741606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227006.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 664741606 is about 25782.5833849132. The cubic root of 664741606 is about 872.7388063981.

The spelling of 664741606 in words is "six hundred sixty-four million, seven hundred forty-one thousand, six hundred six".