643362364401 has 4 divisors (see below), whose sum is σ = 857816485872. Its totient is φ = 428908242932.

The previous prime is 643362364373. The next prime is 643362364433. The reversal of 643362364401 is 104463263346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643362364401 - 2¹⁰ = 643362363377 is a prime.

It is a super-2 number, since 2×643362364401² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643362364471) 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, 107227060731 + ... + 107227060736.

It is an arithmetic number, because the mean of its divisors is an integer number (214454121468).

Almost surely, 2^643362364401 is an apocalyptic number.

It is an amenable number.

643362364401 is a deficient number, since it is larger than the sum of its proper divisors (214454121471).

643362364401 is a wasteful number, since it uses less digits than its factorization.

643362364401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214454121470.

The product of its (nonzero) digits is 746496, while the sum is 42.

The spelling of 643362364401 in words is "six hundred forty-three billion, three hundred sixty-two million, three hundred sixty-four thousand, four hundred one".