664726503 has 48 divisors (see below), whose sum is σ = 1095915744. Its totient is φ = 356106240.

The previous prime is 664726471. The next prime is 664726507. The reversal of 664726503 is 305627466.

It is not a de Polignac number, because 664726503 - 2⁵ = 664726471 is a prime.

It is a super-2 number, since 2×664726503² = 883722647581218018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664726507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1151751 + ... + 1152327.

It is an arithmetic number, because the mean of its divisors is an integer number (22831578).

Almost surely, 2^664726503 is an apocalyptic number.

664726503 is a deficient number, since it is larger than the sum of its proper divisors (431189241).

664726503 is a wasteful number, since it uses less digits than its factorization.

664726503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1065 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 664726503 is about 25782.2904917309. The cubic root of 664726503 is about 872.7321967752.

The spelling of 664726503 in words is "six hundred sixty-four million, seven hundred twenty-six thousand, five hundred three".