643123644535620 has 192 divisors, whose sum is σ = 2077137101088000. Its totient is φ = 165000747727872.

The previous prime is 643123644535613. The next prime is 643123644535621. The reversal of 643123644535620 is 26535446321346.

643123644535620 is a `hidden beast` number, since 6 + 4 + 3 + 1 + 2 + 3 + 6 + 4 + 4 + 5 + 3 + 5 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (643123644535621) 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, 68126385 + ... + 76989944.

It is an arithmetic number, because the mean of its divisors is an integer number (10818422401500).

Almost surely, 2^{643123644535620} is an apocalyptic number.

643123644535620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643123644535620 is an abundant number, since it is smaller than the sum of its proper divisors (1434013456552380).

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

643123644535620 is a wasteful number, since it uses less digits than its factorization.

643123644535620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145116659 (or 145116651 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 54.

The spelling of 643123644535620 in words is "six hundred forty-three trillion, one hundred twenty-three billion, six hundred forty-four million, five hundred thirty-five thousand, six hundred twenty".