4021556604556 has 18 divisors (see below), whose sum is σ = 7427625670500. Its totient is φ = 1904947864632.

The previous prime is 4021556604551. The next prime is 4021556604563. The reversal of 4021556604556 is 6554066551204.

It is not an unprimeable number, because it can be changed into a prime (4021556604551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1392504306 + ... + 1392507193.

Almost surely, 2^{4021556604556} is an apocalyptic number.

It is an amenable number.

4021556604556 is a deficient number, since it is larger than the sum of its proper divisors (3406069065944).

4021556604556 is a wasteful number, since it uses less digits than its factorization.

4021556604556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785011541 (or 2785011520 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 4021556604556 in words is "four trillion, twenty-one billion, five hundred fifty-six million, six hundred four thousand, five hundred fifty-six".