643541197848 has 64 divisors (see below), whose sum is σ = 1630303718400. Its totient is φ = 211657255680.

The previous prime is 643541197847. The next prime is 643541197879. The reversal of 643541197848 is 848791145346.

It is a super-2 number, since 2×643541197848² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643541197791 and 643541197800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643541197847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2752540 + ... + 2977172.

It is an arithmetic number, because the mean of its divisors is an integer number (25473495600).

Almost surely, 2^643541197848 is an apocalyptic number.

It is an amenable number.

643541197848 is an abundant number, since it is smaller than the sum of its proper divisors (986762520552).

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

643541197848 is a wasteful number, since it uses less digits than its factorization.

643541197848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226232 (or 226228 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 60.

The spelling of 643541197848 in words is "six hundred forty-three billion, five hundred forty-one million, one hundred ninety-seven thousand, eight hundred forty-eight".