4021665544 has 32 divisors (see below), whose sum is σ = 8293461120. Its totient is φ = 1816658496.

The previous prime is 4021665541. The next prime is 4021665559. The reversal of 4021665544 is 4455661204.

It is not an unprimeable number, because it can be changed into a prime (4021665541) 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, 406494 + ... + 416269.

It is an arithmetic number, because the mean of its divisors is an integer number (259170660).

Almost surely, 2^4021665544 is an apocalyptic number.

It is an amenable number.

4021665544 is an abundant number, since it is smaller than the sum of its proper divisors (4271795576).

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

4021665544 is a wasteful number, since it uses less digits than its factorization.

4021665544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822829 (or 822825 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 4021665544 is about 63416.6030626050. The cubic root of 4021665544 is about 1590.2618853206.

The spelling of 4021665544 in words is "four billion, twenty-one million, six hundred sixty-five thousand, five hundred forty-four".