664194635 has 16 divisors (see below), whose sum is σ = 868692384. Its totient is φ = 484568832.

The previous prime is 664194617. The next prime is 664194637. The reversal of 664194635 is 536491466.

It is a cyclic number.

It is not a de Polignac number, because 664194635 - 2¹² = 664190539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664194637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56162 + ... + 66951.

It is an arithmetic number, because the mean of its divisors is an integer number (54293274).

Almost surely, 2^664194635 is an apocalyptic number.

664194635 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664194635 is a deficient number, since it is larger than the sum of its proper divisors (204497749).

664194635 is a wasteful number, since it uses less digits than its factorization.

664194635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123214.

The product of its digits is 466560, while the sum is 44.

The square root of 664194635 is about 25771.9738281723. The cubic root of 664194635 is about 872.4993680945.

The spelling of 664194635 in words is "six hundred sixty-four million, one hundred ninety-four thousand, six hundred thirty-five".