4066665121 has 4 divisors (see below), whose sum is σ = 4243476672. Its totient is φ = 3889853572.

The previous prime is 4066665049. The next prime is 4066665139. The reversal of 4066665121 is 1215666604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4066665121 - 2¹³ = 4066656929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4066665221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88405741 + ... + 88405786.

It is an arithmetic number, because the mean of its divisors is an integer number (1060869168).

Almost surely, 2^4066665121 is an apocalyptic number.

It is an amenable number.

4066665121 is a deficient number, since it is larger than the sum of its proper divisors (176811551).

4066665121 is a wasteful number, since it uses less digits than its factorization.

4066665121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176811550.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 4066665121 is about 63770.4094467018. The cubic root of 4066665121 is about 1596.1711992835.

The spelling of 4066665121 in words is "four billion, sixty-six million, six hundred sixty-five thousand, one hundred twenty-one".