666365145421 has 16 divisors (see below), whose sum is σ = 748956003840. Its totient is φ = 589802819760.

The previous prime is 666365145401. The next prime is 666365145463. The reversal of 666365145421 is 124541563666.

666365145421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 666365145421 - 2⁵ = 666365145389 is a prime.

It is a super-3 number, since 3×666365145421³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666365145401) 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, 17712175 + ... + 17749756.

It is an arithmetic number, because the mean of its divisors is an integer number (46809750240).

Almost surely, 2^666365145421 is an apocalyptic number.

It is an amenable number.

666365145421 is a deficient number, since it is larger than the sum of its proper divisors (82590858419).

666365145421 is a wasteful number, since it uses less digits than its factorization.

666365145421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35462016.

The product of its digits is 3110400, while the sum is 49.

The spelling of 666365145421 in words is "six hundred sixty-six billion, three hundred sixty-five million, one hundred forty-five thousand, four hundred twenty-one".