666243123155607 has 8 divisors (see below), whose sum is σ = 902886855424240. Its totient is φ = 436880736495360.

The previous prime is 666243123155579. The next prime is 666243123155609. The reversal of 666243123155607 is 706551321342666.

666243123155607 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666243123155607 - 2¹² = 666243123151511 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 (666243123155609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820336401882 + ... + 1820336402247.

It is an arithmetic number, because the mean of its divisors is an integer number (112860856928030).

Almost surely, 2^{666243123155607} is an apocalyptic number.

666243123155607 is a deficient number, since it is larger than the sum of its proper divisors (236643732268633).

666243123155607 is a wasteful number, since it uses less digits than its factorization.

666243123155607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640672804193.

The product of its (nonzero) digits is 32659200, while the sum is 57.

The spelling of 666243123155607 in words is "six hundred sixty-six trillion, two hundred forty-three billion, one hundred twenty-three million, one hundred fifty-five thousand, six hundred seven".