4021655568 has 40 divisors (see below), whose sum is σ = 11873460288. Its totient is φ = 1149044352.

The previous prime is 4021655567. The next prime is 4021655579. The reversal of 4021655568 is 8655561204.

4021655568 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (4021655567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5984271 + ... + 5984942.

Almost surely, 2^4021655568 is an apocalyptic number.

4021655568 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

4021655568 is an abundant number, since it is smaller than the sum of its proper divisors (7851804720).

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

4021655568 is a wasteful number, since it uses less digits than its factorization.

4021655568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11969231 (or 11969225 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 4021655568 is about 63416.5244080752. The cubic root of 4021655568 is about 1590.2605704039.

The spelling of 4021655568 in words is "four billion, twenty-one million, six hundred fifty-five thousand, five hundred sixty-eight".