4020016665 has 16 divisors (see below), whose sum is σ = 7350887808. Its totient is φ = 1837721856.

The previous prime is 4020016621. The next prime is 4020016669. The reversal of 4020016665 is 5666100204.

It is not a de Polignac number, because 4020016665 - 2¹⁸ = 4019754521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4020016669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19142832 + ... + 19143041.

It is an arithmetic number, because the mean of its divisors is an integer number (459430488).

Almost surely, 2^4020016665 is an apocalyptic number.

It is an amenable number.

4020016665 is a deficient number, since it is larger than the sum of its proper divisors (3330871143).

4020016665 is a wasteful number, since it uses less digits than its factorization.

4020016665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38285888.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 4020016665 is about 63403.6013567053. The cubic root of 4020016665 is about 1590.0445203309.

Adding to 4020016665 its reverse (5666100204), we get a palindrome (9686116869).

It can be divided in two parts, 40200 and 16665, that added together give a palindrome (56865).

The spelling of 4020016665 in words is "four billion, twenty million, sixteen thousand, six hundred sixty-five".