666009358639 has 2 divisors, whose sum is σ = 666009358640. Its totient is φ = 666009358638.

The previous prime is 666009358621. The next prime is 666009358657. The reversal of 666009358639 is 936853900666.

It is a balanced prime because it is at equal distance from previous prime (666009358621) and next prime (666009358657).

It is a cyclic number.

It is not a de Polignac number, because 666009358639 - 2⁵ = 666009358607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666009358739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333004679319 + 333004679320.

It is an arithmetic number, because the mean of its divisors is an integer number (333004679320).

Almost surely, 2^666009358639 is an apocalyptic number.

666009358639 is a deficient number, since it is larger than the sum of its proper divisors (1).

666009358639 is an equidigital number, since it uses as much as digits as its factorization.

666009358639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37791360, while the sum is 61.

The spelling of 666009358639 in words is "six hundred sixty-six billion, nine million, three hundred fifty-eight thousand, six hundred thirty-nine".