666404623233078 has 16 divisors (see below), whose sum is σ = 1332816384692016. Its totient is φ = 222133684706720.

The previous prime is 666404623233073. The next prime is 666404623233091. The reversal of 666404623233078 is 870332326404666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666404623233071) 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, 296212053 + ... + 298453328.

It is an arithmetic number, because the mean of its divisors is an integer number (83301024043251).

Almost surely, 2^{666404623233078} is an apocalyptic number.

666404623233078 is an abundant number, since it is smaller than the sum of its proper divisors (666411761458938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666404623233078 is a wasteful number, since it uses less digits than its factorization.

666404623233078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594852159.

The product of its (nonzero) digits is 125411328, while the sum is 60.

The spelling of 666404623233078 in words is "six hundred sixty-six trillion, four hundred four billion, six hundred twenty-three million, two hundred thirty-three thousand, seventy-eight".