664651542503 has 24 divisors (see below), whose sum is σ = 786579386880. Its totient is φ = 557523187200.

The previous prime is 664651542497. The next prime is 664651542521. The reversal of 664651542503 is 305245156466.

It is not a de Polignac number, because 664651542503 - 2⁴ = 664651542487 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664651541503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2941223 + ... + 3159128.

It is an arithmetic number, because the mean of its divisors is an integer number (32774141120).

Almost surely, 2^664651542503 is an apocalyptic number.

664651542503 is a deficient number, since it is larger than the sum of its proper divisors (121927844377).

664651542503 is a wasteful number, since it uses less digits than its factorization.

664651542503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6100427 (or 6100410 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

Adding to 664651542503 its reverse (305245156466), we get a palindrome (969896698969).

The spelling of 664651542503 in words is "six hundred sixty-four billion, six hundred fifty-one million, five hundred forty-two thousand, five hundred three".