666388414848 has 128 divisors (see below), whose sum is σ = 1934707864320. Its totient is φ = 201982150656.

The previous prime is 666388414847. The next prime is 666388415003. The reversal of 666388414848 is 848414883666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666388414847) 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, 661740 + ... + 1330667.

It is an arithmetic number, because the mean of its divisors is an integer number (15114905190).

Almost surely, 2^666388414848 is an apocalyptic number.

It is an amenable number.

666388414848 is an abundant number, since it is smaller than the sum of its proper divisors (1268319449472).

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

666388414848 is a wasteful number, since it uses less digits than its factorization.

666388414848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992504 (or 1992492 counting only the distinct ones).

The product of its digits is 169869312, while the sum is 66.

The spelling of 666388414848 in words is "six hundred sixty-six billion, three hundred eighty-eight million, four hundred fourteen thousand, eight hundred forty-eight".