643123644535619 has 64 divisors (see below), whose sum is σ = 709299198558720. Its totient is φ = 579493400048640.

The previous prime is 643123644535613. The next prime is 643123644535621. The reversal of 643123644535619 is 916535446321346.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643123644535619 is a prime.

It is a super-2 number, since 2×643123644535619² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643123644535613) 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, 138514674512 + ... + 138514679154.

It is an arithmetic number, because the mean of its divisors is an integer number (11082799977480).

Almost surely, 2^{643123644535619} is an apocalyptic number.

643123644535619 is a deficient number, since it is larger than the sum of its proper divisors (66175554023101).

643123644535619 is a wasteful number, since it uses less digits than its factorization.

643123644535619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7092.

The product of its digits is 167961600, while the sum is 62.

The spelling of 643123644535619 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 nineteen".