643403663053 has 8 divisors (see below), whose sum is σ = 678657715520. Its totient is φ = 608288680800.

The previous prime is 643403663051. The next prime is 643403663087. The reversal of 643403663053 is 350366304346.

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 643403663053 - 2¹ = 643403663051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643403663051) 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, 34758048 + ... + 34776553.

It is an arithmetic number, because the mean of its divisors is an integer number (84832214440).

Almost surely, 2^643403663053 is an apocalyptic number.

It is an amenable number.

643403663053 is a deficient number, since it is larger than the sum of its proper divisors (35254052467).

643403663053 is a wasteful number, since it uses less digits than its factorization.

643403663053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69535107.

The product of its (nonzero) digits is 1399680, while the sum is 43.

Adding to 643403663053 its reverse (350366304346), we get a palindrome (993769967399).

The spelling of 643403663053 in words is "six hundred forty-three billion, four hundred three million, six hundred sixty-three thousand, fifty-three".