643624164042 has 16 divisors (see below), whose sum is σ = 1287256305312. Its totient is φ = 214540058480.

The previous prime is 643624164023. The next prime is 643624164067. The reversal of 643624164042 is 240461426346.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 643624163985 and 643624164003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1459933 + ... + 1848959.

It is an arithmetic number, because the mean of its divisors is an integer number (80453519082).

Almost surely, 2^643624164042 is an apocalyptic number.

643624164042 is an abundant number, since it is smaller than the sum of its proper divisors (643632141270).

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

643624164042 is a wasteful number, since it uses less digits than its factorization.

643624164042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664773.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 643624164042 in words is "six hundred forty-three billion, six hundred twenty-four million, one hundred sixty-four thousand, forty-two".