643465311503 has 8 divisors (see below), whose sum is σ = 736016937600. Its totient is φ = 551070687960.

The previous prime is 643465311487. The next prime is 643465311521. The reversal of 643465311503 is 305113564346.

643465311503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643465311503 - 2⁴ = 643465311487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643465311803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39241853 + ... + 39258246.

It is an arithmetic number, because the mean of its divisors is an integer number (92002117200).

Almost surely, 2^643465311503 is an apocalyptic number.

643465311503 is a deficient number, since it is larger than the sum of its proper divisors (92551626097).

643465311503 is a wasteful number, since it uses less digits than its factorization.

643465311503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78501277.

The product of its (nonzero) digits is 388800, while the sum is 41.

Adding to 643465311503 its reverse (305113564346), we get a palindrome (948578875849).

The spelling of 643465311503 in words is "six hundred forty-three billion, four hundred sixty-five million, three hundred eleven thousand, five hundred three".