643304532464 has 30 divisors (see below), whose sum is σ = 1370012704200. Its totient is φ = 292411150240.

The previous prime is 643304532391. The next prime is 643304532469. The reversal of 643304532464 is 464235403346.

It is a happy number.

643304532464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×643304532464² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643304532469) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166140764 + ... + 166144635.

It is an arithmetic number, because the mean of its divisors is an integer number (45667090140).

Almost surely, 2^643304532464 is an apocalyptic number.

It is an amenable number.

643304532464 is an abundant number, since it is smaller than the sum of its proper divisors (726708171736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643304532464 is a wasteful number, since it uses less digits than its factorization.

643304532464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332285429 (or 332285412 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 44.

The spelling of 643304532464 in words is "six hundred forty-three billion, three hundred four million, five hundred thirty-two thousand, four hundred sixty-four".