666768043819 has 16 divisors (see below), whose sum is σ = 690569399520. Its totient is φ = 643021182720.

The previous prime is 666768043801. The next prime is 666768043847. The reversal of 666768043819 is 918340867666.

It is a cyclic number.

It is not a de Polignac number, because 666768043819 - 2¹⁹ = 666767519531 is a prime.

It is a super-2 number, since 2×666768043819² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666768043219) 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, 123770844 + ... + 123776230.

It is an arithmetic number, because the mean of its divisors is an integer number (43160587470).

Almost surely, 2^666768043819 is an apocalyptic number.

666768043819 is a deficient number, since it is larger than the sum of its proper divisors (23801355701).

666768043819 is a wasteful number, since it uses less digits than its factorization.

666768043819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9630.

The product of its (nonzero) digits is 62705664, while the sum is 64.

The spelling of 666768043819 in words is "six hundred sixty-six billion, seven hundred sixty-eight million, forty-three thousand, eight hundred nineteen".