664350626 has 4 divisors (see below), whose sum is σ = 996525942. Its totient is φ = 332175312.

The previous prime is 664350613. The next prime is 664350641. The reversal of 664350626 is 626053466.

It is a Cunningham number, because it is equal to 25775²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 664350625 + 1 = 25775^2 + 1^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664350626.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166087655 + ... + 166087658.

Almost surely, 2^664350626 is an apocalyptic number.

664350626 is a deficient number, since it is larger than the sum of its proper divisors (332175316).

664350626 is a wasteful number, since it uses less digits than its factorization.

664350626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332175315.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 664350626 is about 25775.0000193986. Note that the first 4 decimals coincide. The cubic root of 664350626 is about 872.5676670480.

The spelling of 664350626 in words is "six hundred sixty-four million, three hundred fifty thousand, six hundred twenty-six".