664603250903 has 4 divisors (see below), whose sum is σ = 664644911280. Its totient is φ = 664561590528.

The previous prime is 664603250897. The next prime is 664603250939. The reversal of 664603250903 is 309052306466.

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

It is a cyclic number.

It is not a de Polignac number, because 664603250903 - 2²² = 664599056599 is a prime.

It is a super-2 number, since 2×664603250903² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664603252903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20806250 + ... + 20838167.

It is an arithmetic number, because the mean of its divisors is an integer number (166161227820).

Almost surely, 2^664603250903 is an apocalyptic number.

664603250903 is a deficient number, since it is larger than the sum of its proper divisors (41660377).

664603250903 is a wasteful number, since it uses less digits than its factorization.

664603250903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41660376.

The product of its (nonzero) digits is 699840, while the sum is 44.

The spelling of 664603250903 in words is "six hundred sixty-four billion, six hundred three million, two hundred fifty thousand, nine hundred three".