643105523804 has 6 divisors (see below), whose sum is σ = 1125434666664. Its totient is φ = 321552761900.

The previous prime is 643105523783. The next prime is 643105523807. The reversal of 643105523804 is 408325501346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643105523807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80388190472 + ... + 80388190479.

It is an arithmetic number, because the mean of its divisors is an integer number (187572444444).

Almost surely, 2^643105523804 is an apocalyptic number.

It is an amenable number.

643105523804 is a deficient number, since it is larger than the sum of its proper divisors (482329142860).

643105523804 is a wasteful number, since it uses less digits than its factorization.

643105523804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160776380955 (or 160776380953 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 643105523804 in words is "six hundred forty-three billion, one hundred five million, five hundred twenty-three thousand, eight hundred four".