643163522526104 has 8 divisors (see below), whose sum is σ = 1205931604736460. Its totient is φ = 321581761263048.

The previous prime is 643163522526073. The next prime is 643163522526143. The reversal of 643163522526104 is 401625225361346.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×643163522526104² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40197720157874 + ... + 40197720157889.

Almost surely, 2^{643163522526104} is an apocalyptic number.

It is an amenable number.

643163522526104 is a deficient number, since it is larger than the sum of its proper divisors (562768082210356).

643163522526104 is a wasteful number, since it uses less digits than its factorization.

643163522526104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80395440315769 (or 80395440315765 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 643163522526104 in words is "six hundred forty-three trillion, one hundred sixty-three billion, five hundred twenty-two million, five hundred twenty-six thousand, one hundred four".