643430536343040 has 160 divisors (see below), whose sum is σ = 2056981820737536. Its totient is φ = 171580239749120.

The previous prime is 643430536343039. The next prime is 643430536343113. The reversal of 643430536343040 is 40343635034346.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1659231409 + ... + 1659619151.

Almost surely, 2^{643430536343040} is an apocalyptic number.

643430536343040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643430536343040 is an abundant number, since it is smaller than the sum of its proper divisors (1413551284394496).

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

643430536343040 is a wasteful number, since it uses less digits than its factorization.

643430536343040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603840 (or 603824 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 48.

The spelling of 643430536343040 in words is "six hundred forty-three trillion, four hundred thirty billion, five hundred thirty-six million, three hundred forty-three thousand, forty".