666006435615243 has 16 divisors (see below), whose sum is σ = 892051868916000. Its totient is φ = 441985395033600.

The previous prime is 666006435615193. The next prime is 666006435615253. The reversal of 666006435615243 is 342516534600666.

It is not a de Polignac number, because 666006435615243 - 2³⁶ = 665937716138507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666006435615253) 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, 342613968 + ... + 344552381.

It is an arithmetic number, because the mean of its divisors is an integer number (55753241807250).

Almost surely, 2^{666006435615243} is an apocalyptic number.

666006435615243 is a deficient number, since it is larger than the sum of its proper divisors (226045433300757).

666006435615243 is a wasteful number, since it uses less digits than its factorization.

666006435615243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687167822.

The product of its (nonzero) digits is 55987200, while the sum is 57.

The spelling of 666006435615243 in words is "six hundred sixty-six trillion, six billion, four hundred thirty-five million, six hundred fifteen thousand, two hundred forty-three".