666434418145824 has 48 divisors (see below), whose sum is σ = 1749417683906592. Its totient is φ = 222141334775808.

The previous prime is 666434418145759. The next prime is 666434418145829. The reversal of 666434418145824 is 428541814434666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (666434418145829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48059454 + ... + 60353789.

It is an arithmetic number, because the mean of its divisors is an integer number (36446201748054).

Almost surely, 2^{666434418145824} is an apocalyptic number.

It is an amenable number.

666434418145824 is an abundant number, since it is smaller than the sum of its proper divisors (1082983265760768).

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

666434418145824 is a wasteful number, since it uses less digits than its factorization.

666434418145824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108477289 (or 108477281 counting only the distinct ones).

The product of its digits is 424673280, while the sum is 66.

The spelling of 666434418145824 in words is "six hundred sixty-six trillion, four hundred thirty-four billion, four hundred eighteen million, one hundred forty-five thousand, eight hundred twenty-four".