666020430535 has 16 divisors (see below), whose sum is σ = 806796619776. Its totient is φ = 527769544608.

The previous prime is 666020430499. The next prime is 666020430539. The reversal of 666020430535 is 535034020666.

It is a cyclic number.

It is not a de Polignac number, because 666020430535 - 2⁷ = 666020430407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666020430539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4358434 + ... + 4508656.

It is an arithmetic number, because the mean of its divisors is an integer number (50424788736).

Almost surely, 2^666020430535 is an apocalyptic number.

666020430535 is a deficient number, since it is larger than the sum of its proper divisors (140776189241).

666020430535 is a wasteful number, since it uses less digits than its factorization.

666020430535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158622.

The product of its (nonzero) digits is 388800, while the sum is 40.

The spelling of 666020430535 in words is "six hundred sixty-six billion, twenty million, four hundred thirty thousand, five hundred thirty-five".