643813528029 has 64 divisors (see below), whose sum is σ = 1029488640000. Its totient is φ = 349914831552.

The previous prime is 643813527997. The next prime is 643813528049. The reversal of 643813528029 is 920825318346.

It is a happy number.

It is not a de Polignac number, because 643813528029 - 2⁵ = 643813527997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643813528049) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68203092 + ... + 68212530.

It is an arithmetic number, because the mean of its divisors is an integer number (16085760000).

Almost surely, 2^643813528029 is an apocalyptic number.

643813528029 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

643813528029 is a deficient number, since it is larger than the sum of its proper divisors (385675111971).

643813528029 is a wasteful number, since it uses less digits than its factorization.

643813528029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10254.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 643813528029 in words is "six hundred forty-three billion, eight hundred thirteen million, five hundred twenty-eight thousand, twenty-nine".